Single crystal nickel-based superalloy

ABSTRACT

This invention relates to a single crystal casting to be used under high stress, high temperature conditions up to about 2030° F., characterized by an increased resistance to creep under such conditions. The casting is made from a nickel-based superalloy consisting essentially of the following elements in percent by weight: from 6.2 to 6.8 percent rhenium, from 1.8 to 2.5 percent chromium, from 1.5 to 2.5 percent cobalt, from 8 to 9 percent tantalum, from 3.5 to 6 percent tungsten, from 5.5 to 6.1 percent aluminum, from 0.1 to 0.5 percent titanium, from 0.01 to 0.1 percent columbium, from 0.25 to 0.60 percent molybdenum, from 0 to 0.05 percent hafnium, from 0 to 0.04 percent carbon, from 0 to 0.01 percent boron, from 0 to 0.01 percent yttrium, from 0 to 0.01 percent cerium, from 0 to 0.01 percent lanthanum, from 0 to 0.04 percent manganese, from 0 to 0.05 percent silicon, form 0 to 0.01 percent zirconium, from 0 to 0.001 percent sulfur, from 0 to 0.10 percent vanadium, and the balance nickel+ incidental impurities. The superalloy has a phasial stability number N v3b  less than about 1.65.

This application claims benefit of the filing date of PCT\U.S. 93\06213 entitled "SINGLE CRYSTAL NICKEL-BASED SUPERALLOY" filed on Jun. 29, 1993, and is a continuation-in-part of U.S. patent application Ser. No. 905,462 entitled "SINGLE CRYSTAL NICKEL-BASED SUPERALLOY" filed on Jun. 29, 1992, now U.S. Pat. No. 5,366,695, the disclosure of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to single crystal nickel-based superalloys and, more particularly, single crystal nickel-based superalloys and articles made therefrom for use in advanced gas turbine engines under high stress, high temperature conditions.

2. Description of the Prior Art

Advances over recent years in the metal temperature and stress capability of single crystal articles have been the result of the continuing development of single crystal superalloys, as well as improvements in casting processes and engine application technology. These single crystal superalloy articles include rotating and stationary turbine blades and vanes found in the hot sections of gas turbine engines. However, gas turbine engine design goals have remained the same during the past decades. These goals include the desire to increase engine operating temperature, rotational speed, thrust-to-weight ratio, fuel efficiency, and engine component durability and reliability.

The basic technology of alloys for the casting of single crystal components is described in U.S. Pat. Nos. 3,494,709; 4,116,723 and 4,209,348. Development work resulted in first generation nickel-based superalloys, which were materially improved over those described in the aforementioned patents. However, these first generation nickel-based superalloys contained no rhenium. Examples of such first generation nickel-based superalloys, commercially known as CMSX-2 alloy and CMSX-3 alloy produced by Cannon-Muskegon Corporation, assignee of the present application, are described in U.S. Pat. No. 4,582,548. Further development work resulted in second generation nickel-based superalloys having improved creep strength/creep rate. These second generation nickel-based superalloys have a moderate rhenium content of about 3 weight percent. An example of such a second generation nickel-based superalloy is described in U.S. Pat. No. 4,643,782. This patent discloses a superalloy, commercially known as CMSX-4 alloy, having a specific nickel-based composition including a rhenium content in the range of 2.8-3.2 weight percent. The present invention provides the next generation of nickel-based superalloys having higher total refractory element (W+Re+Mo+Ta) content and improved mechanical properties.

Single crystal articles are generally produced having the low-modulus (001) crystallographic orientation parallel to the component dendritic growth pattern or blade stacking axis. Face-centered cubic (FCC) superalloy single crystals grown in the (001) direction provide extremely good thermal fatigue resistance relative to conventionally cast articles. Since these single crystal articles have no grain boundaries, alloy design without grain boundary strengtheners, such as carbon, boron and zirconium, is possible. As these elements are alloy melting point depressants, their reduction from an alloy design provides a greater potential for high temperature mechanical strength achievement since more complete gamma prime solution and microstructural homogenization can be achieved relative to directionally solidified (DS) columnar grain and conventionally cast materials. Their reduction also makes possible a higher incipient melting temperature.

These process benefits are not necessarily realized unless a multi-faceted alloy design approach is undertaken. Alloys must be designed to avoid tendency for casting defect formation such as freckles, slivers, spurious grains and recrystallization. Additionally, the alloys must provide an adequate heat treatment window (numeric difference between an alloy's gamma prime solvus and incipient melting point) to allow for nearly complete gamma prime solutioning. At the same time, the alloy compositional balance should be designed to provide an adequate blend of engineering properties necessary for operation in gas turbine engines. Selected properties generally considered important by gas turbine engine designers include: elevated temperature creep-rupture strength, thermo-mechanical fatigue resistance, impact resistance plus hot corrosion and oxidation resistance.

An alloy designer can attempt to improve one or two of these design properties by adjusting the compositional balance of known superalloys. However, it is extremely difficult to improve more than one or two of the design properties without significantly or even severely compromising the remaining properties. The unique superalloy of the present invention provides an excellent blend of the properties necessary for use in producing single crystal articles for operation in gas turbine engine hot sections.

SUMMARY OF THE INVENTION

This invention relates to a nickel-based superalloy comprising the following elements in percent by weight: from about 5.0 to about 7.0 percent rhenium, from about 1.8 to about 4.0 percent chromium, from about 1.5 to about 9.0 percent cobalt, from about 7.0 to about 10.0 percent tantalum, from about 3.5 to about 7.5 percent tungsten, from about 5.0 to about 7.0 percent aluminum, from about 0.1 to about 1.2 percent titanium, from about 0 to about 0.5 percent columbium, from about 0.25 to about 2.0 percent molybdenum, from about 0 to about 0.15 percent hafnium, and the balance nickel plus incidental impurities, the superalloy having a phasial stability number N_(V3B) less than about 2.10.

Advantageously, this superalloy composition may be further comprised of (percentages are in weight percent) from about 0 to about 0.04 percent carbon, from about 0 to about 0.01 percent boron, from about 0 to about 0.01 percent yttrium, from about 0 to about 0.01 percent cerium and from about 0 to about 0.01 percent lanthanum. Although incidental impurities should be kept to the least amount possible, the superalloy can also be comprised of from about 0 to about 0.04 percent manganese, from about 0 to about 0.05 percent silicon, from about 0 to about 0.01 percent zirconium, from about 0 to about 0.001 percent sulfur, and from about 0 to about 0.10 percent vanadium. In all cases, the base element is nickel. Furthermore, this superalloy can advantageously have a phasial stability number N_(V3B) less than about 1.85, and a chromium content of from about 1.8 to about 3.0 percent, a rhenium content of from about 5.5 to about 6.5 percent, and a cobalt content of from about 2.0 to about 5.0 percent. This invention provides a superalloy having an increased resistance to creep under high stress, high temperature conditions, particularly up to about 2030° F.

In one preferred embodiment, this invention relates to a single crystal casting to be used under high stress, high temperature conditions up to about 2030° F. characterized by an increased resistance to creep under such conditions. In this embodiment, the casting is made from a nickel-based superalloy consisting essentially of the following elements in percent by weight: from 6.2 to 6.8 percent rhenium, from 1.8 to 2.5 percent chromium, from 1.5 to 2.5 percent cobalt, from 8.0 to 9.0 percent tantalum, from 3.5 to 6.0 percent tungsten, from 5.5 to 6.1 percent aluminum, from 0.1 to 0.5 percent titanium, from 0.01 to 0.1 percent columbium, from 0.25 to 0.60 percent molybdenum, from 0 to 0.05 percent hafnium, from 0 to 0.04 percent carbon, from 0 to 0.01 percent boron, from 0 to 0.01 percent yttrium, from 0 to 0.01 percent cerium, from 0 to 0.01 percent lanthanum, from 0 to 0.04 percent manganese, from 0 to 0.05 percent silicon, from 0 to 0.01 percent zirconium, from 0 to 0.001 percent sulfur, from 0 to 0.10 percent vanadium, and the balance nickel+incidental impurities, wherein the superalloy has a phasial stability number N_(V3B) less than about 1.65.

Single crystal articles can be suitably made from the superalloy of this invention. The article can be a component for a turbine engine and, more particularly, the component can be a gas turbine blade or gas turbine vane.

The superalloy compositions of this invention have a critically balanced alloy chemistry which results in a unique blend of desirable properties. These properties include: excellent single crystal component castability, particularly for moderately sized blade and vane components; adequate cast component solutionability; excellent resistance to single crystal cast component recrystallization; ultra-high creep-rupture strength to about 2030° F.; extremely good smooth and notched low cycle fatigue strength; extremely good high cycle fatigue strength; high impact strength; very good bare hot corrosion resistance; very good bare oxidation resistance; adequate coatability; and adequate microstructural stability, such as resistance to the undesirable, brittle phases called topologically close-packed (TCP) phases.

Accordingly, it is an object of the present invention to provide superalloy compositions and single crystal articles made therefrom having a unique blend of desirable properties. It is a further object of the present invention to provide superalloys and single crystal articles made therefrom for use in advanced gas turbine engines under high stress, high temperature conditions, such as up to about 2030° F. These and other objects and advantages of the present invention will be apparent to those skilled in the art upon reference to the following description of the preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a chart of hot corrosion test results performed to 117 hours on one embodiment of the alloy of this invention and on two prior art alloys;

FIG. 2 is a chart of hot corrosion test results performed to 144 hours on another embodiment of the alloy of this invention and on a prior art alloy;

FIG. 3 is a graphical comparison of bare alloy oxidation data from tests performed at 2012° F. on two embodiments of this invention and on three other alloys;

FIG. 4 is a graphical comparison of bare alloy oxidation data from tests performed at 1886° F. on two embodiments of this invention and on three other alloys;

FIG. 5 is a graphical comparison of bare alloy corrosion data from tests performed at 1742° F. on two embodiments of this invention and on two other alloys; and

FIG. 6 is a graphical comparison of bare alloy corrosion data from tests performed at 1742° F. on four embodiments of this invention and on two other alloys.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The nickel-based superalloy of the present invention comprises the following elements in percent by weight:

    ______________________________________                                         Rhenium              about 5.0-7.0                                             Chromium             about 1.8-4.0                                             Cobalt               about 1.5-9.0                                             Tantalum             about 7.0-10.0                                            Tungsten             about 3.5-7.5                                             Aluminum             about 5.0-7.0                                             Titanium             about 0.1-1.2                                             Columbium            about 0-0.5                                               Molybdenum           about 0.25-2.0                                            Hafnium              about 0-0.15                                              Nickel + Incidental  balance                                                   Impurities                                                                     ______________________________________                                    

This superalloy composition also has a phasial stability number N_(V3B) less than about 2.10. Further, this invention has a critically balanced alloy chemistry which results in a unique blend of desirable properties. These properties include increased creep-rupture strength relative to prior art single crystal superalloys, single crystal component castability, cast component solutionability, single crystal component resistance to recrystallization, fatigue strength, impact strength, bare hot corrosion resistance, bare oxidation resistance, component coatability, and microstructural stability, including resistance to TCP phase formation under high stress, high temperature conditions. Unlike prior nickel-based superalloys known in the art, the superalloys of the present invention have a low chromium, low cobalt and high rhenium content. The chromium is about 1.8-4.0% by weight. Advantageously, the chromium content is from 1.8% to 3.0% by weight. This chromium content is significantly lower than that typically found in prior art single crystal nickel-based superalloys. In the present superalloy, chromium provides hot corrosion resistance, although it may also assist with the alloy's oxidation capability. Tantalum and rhenium also assist toward hot corrosion property attainment, and aluminum is present at sufficient levels to provide adequate oxidation resistance, so that relatively low addition of chromium is tolerable in this alloy. Besides lowering the alloy's gamma prime solvus, chromium contributes to the formation of Cr, Re, W-rich TCP phase and must be balanced accordingly in these compositions.

The cobalt content is about 1.5-9.0% by weight. Advantageously, the cobalt content is from 2.0% to 5.0% by weight. This cobalt content is lower than that typically found in prior art single crystal nickel-based superalloys. In the present superalloy, cobalt assists in providing an appropriate heat treatment window since it has the effect of lowering the alloy's gamma prime solvus while generally not affecting its incipient melting point. Rhenium-containing alloys are generally designed with much higher cobalt content than the present invention for the purpose of imparting increased solid solubility and phasial stability. However, the superalloys of the present invention unexpectedly show that much lower cobalt contents are possible and desirable toward providing optimized phasial stability, including control of TCP phase formation.

The rhenium content is about 5.0-7.0% by weight and, advantageously, rhenium is present in an amount of from 5.5% to 6.5% by weight. The amount of rhenium in the superalloy of the present invention is significantly greater than the rhenium content of prior art single crystal nickel-based superalloys. Furthermore, the superalloys of this invention are generally designed with an increased level of refractory element content, e.g., W+Re+Mo+Ta. The tungsten content is about 3.5-7.5% by weight and, advantageously, the amount of tungsten is from 3.5% to 6.5% by weight. Tungsten is added since it is an effective solid solution strengthener and it contributes to strengthening the gamma prime. Additionally, tungsten is effective in raising the alloy's incipient melting temperature. The amount of tungsten added to these superalloys is balanced with the amount of rhenium added since they both contribute to the formation of "freckle" defects during the single crystal investment casting process. They also both strongly effect the propensity for TCP phase formation.

Similar to tungsten, rhenium is effective in raising the alloy's incipient melting point. However, rhenium is a more effective strengthener than tungsten, molybdenum and tantalum in terms of elevated temperature creep-rupture and, therefore, rhenium is added appropriately. Additionally, rhenium has a positive influence on this alloy's hot corrosion resistance. Moreover, rhenium partitions primarily to the gamma matrix, and it is effective in slowing gamma prime particle growth during high temperature, high stress conditions. Besides requiring the balancing of rhenium with tungsten for castability reasons, W+Re must also be set at a level consistent with minimizing TCP phase formation. In general, the TCP phases which occur in such material are rich in chromium, tungsten, and rhenium content, with rhenium being present in the greatest proportion. Thus, careful Re/W ratio control is necessary in this alloy to control the propensity for TCP phase formation.

The molybdenum content is about 0.25-2.0% by weight. Advantageously, molybdenum is present in an amount of from 0.25% to 1.5% by weight. Molybdenum is a good solid solution strengthener, but it is not as effective as tungsten, rhenium and tantalum. However, since the alloy's density is always a design consideration, and the molybdenum atom is lighter than the other solid solution strengtheners, the addition of molybdenum is a means of assisting control of the overall alloy density in the compositions of this invention.

The tantalum content is about 7.0-10.0% by weight and, advantageously, the tantalum content is from 8.0% to 10.0% by weight. Tantalum is a significant contributor to this alloy's strength through means of solid solution strengthening and enhancement of gamma prime particle strength (tantalum also partitions to the gamma prime phase). In this alloy, tantalum is able to be utilized at relatively high concentration since it does not contribute to TCP phase formation. Additionally, tantalum is an attractive single crystal alloy additive in this composition since it assists in preventing "freckle" defect formation during the single crystal casting process. Tantalum is also beneficial in this composition since it tends to raise this alloy's gamma prime solvus, and it is effective toward promoting good alloy oxidation and hot corrosion resistance, along with aluminide coating durability.

The aluminum content is about 5.0-7.0% by weight. Furthermore, the amount of aluminum present in this composition is advantageously from 5.3% to 6.5% by weight. Aluminum and titanium are the primary elements comprising the gamma prime phase. These elements are added in this composition in a proportion and ratio consistent with achieving adequate alloy castability, solution heat treatability, phasial stability and high mechanical strength. Aluminum is also added to this alloy in proportions sufficient to provide oxidation resistance.

The titanium content is about 0.1-1.2% by weight. Advantageously, titanium is present in this composition in an amount from 0.2% to 0.8% by weight. Titanium is generally beneficial to the alloy's hot corrosion resistance, but it can have a negative effect to oxidation resistance, alloy castability and alloy response to solution heat treatment. Accordingly, the titanium content must be maintained within the stated range of this composition.

The columbium content is about 0-0.5% by weight and, advantageously, the columbium content is from 0 to 0.3% by weight. Columbium is a gamma prime forming element and it is an effective strengthener in the nickel-based superalloys of this invention. Generally, however, columbium is a detriment to alloy oxidation and hot corrosion properties, so its addition to the composition of this invention is minimized. Moreover, columbium is added to this invention's composition for the purpose of gettering carbon, which can be chemi-sorbed into component surfaces during non-optimized vacuum solution heat treatment procedures. Any carbon pick-up will tend to form columbium carbide instead of titanium or tantalum carbide, thereby preserving the greatest proportion of titanium and/or tantalum for gamma prime and/or solid solution strengthening in this alloy.

The hafnium content is about 0-0.15% by weight and, advantageously, hafnium is present in an amount from 0.02 to 0.05% by weight. Hafnium is added in a small proportion to the present composition in order to assist with coating adherence. Hafnium generally partitions to the gamma prime phase.

The balance of this invention's superalloy composition is comprised of nickel and small amounts of incidental impurities. Generally, these incidental impurities are entrained from the industrial process of production, and they should be kept to the least amount possible in the composition so that they do not affect the advantageous aspects of the superalloy. For example, these incidental impurities may include up to about 0.04% by weight manganese, up to about 0.05% by weight silicon, up to about 0.01% by weight zirconium, up to about 0.001% by weight sulfur, and up to about 0.10% by weight vanadium. Amounts of these impurities which exceed the stated amounts could have an adverse effect upon the resulting alloy's properties.

Additionally, the superalloy may optionally contain about 0-0.04% by weight carbon, about 0-0.01% by weight boron, about 0-0.01% by weight yttrium, about 0-0.01% by weight cerium and about 0-0.01% by weight lanthanum.

Not only does the superalloy of this invention have a composition within the above specified ranges, but it also has a phasial stability number N_(V3B) less than about 2.10. Advantageously, the phasial stability number N_(V3B) is less than 1.85 and, preferably, the phasial stability number N_(V3B) is less than 1.65. As can be appreciated by those skilled in the art, N_(V3B) is defined by the PWA N-35 method of nickel-based alloy electron vacancy TCP phase control factor calculation. This calculation is as follows:

EQUATION 1

Conversion for weight percent to atomic percent: ##EQU1## where: Wi=weight percent of element i

Ai=atomic weight of element i

EQUATION 2

Calculation for the amount of each element present in the continuous matrix phase:

    ______________________________________                                         Element  Atomic amount Rii remaining                                           ______________________________________                                         Cr       R.sub.Cr = 0.97P.sub.Cr - 0.375P.sub.B - 1.75P.sub.C                  Ni       R.sub.Ni = P.sub.Ni + 0.525P.sub.B - 3(P.sub.Al + 0.03P.sub.Cr +               P.sub.Ti -                                                                     0.5P.sub.C + 0.5P.sub.V + P.sub.Ta + P.sub.Cb + P.sub.Hf)             Ti, Al, B,                                                                              Ri = O                                                                C, Ta, Cb, Hf                                                                  V        Rv = 0.5P.sub.V                                                                 ##STR1##                                                             Mo                                                                                       ##STR2##                                                             ______________________________________                                          *Note:                                                                         weight percentage Re is added to weight percentage W for the calculation       above.                                                                   

EQUATION 3

Calculation of N_(V3B) using atomic factors from Equations 1 and 2 above: ##EQU2## where: i=each individual element in turn.

N_(i) i=the atomic factor of each element in matrix.

(N_(v))i=the electron vacancy No. of each respective element.

This calculation is exemplified in detail in a technical paper entitled "PHACOMP Revisited", by H. J. Murphy, C. T. Sims and A. M. Beltran, published in Volume 1 of International Symposium on Structural Stability in Superalloys (1968), the disclosure which is incorporated by reference herein. As can be appreciated by those skilled in the art, the phasial stability number for the superalloys of this invention is critical and must be less than the stated maximum to provide a stable microstructure and capability for the desired properties under high temperature, high stress conditions. The phasial stability number can be determined empirically, once the practitioner skilled in the art is in possession of the present subject matter.

The superalloy of this invention can be used to suitably make single crystal articles, such as components for turbine engines. Preferably, this superalloy is utilized to make a single crystal casting to be used under high stress, high temperature conditions characterized by an increased resistance to creep under such conditions, particularly high temperature conditions up to about 2030° F. Furthermore, it is believed that this invention has an increased resistance to creep under high stress, high temperature conditions at about 2125° F. and above compared to similar prior art materials, such as the CMSX-4 superalloy. While this superalloy can be used for any purpose requiring high strength castings incorporating a single crystal, its particular use is in the casting of single crystal blades and vanes for gas turbine engines. This alloy possesses an unusual resistance to component recrystallization during solution heat treatment, which is considered an important alloy characteristic that is necessary when producing advanced technology, multi-piece, cast bonded single crystal airfoils. Additionally, this superalloy provides the alloy castability characteristics believed necessary to produce conventional-process-cast, moderately-sized turbine airfoils with intricate cooling passages.

While this superalloy's primary use is in aircraft turbine engines, there are stationary engine applications requiring the specialized high performance characteristics of this alloy. This is particularly the case in turbine engines which require performing characteristics with very restricted clearances, thereby materially limiting the amount of permissible creep. Engines designed to develop high performance characteristics are normally operated at higher component temperatures and, therefore, the problem of creep is increased. Generally, creep in excess of 1% is considered unacceptable in these cases. The creep characteristics of known state of the art alloys have limited operating temperatures and, thus, maximum performance capability. The superalloy of this invention has an increased resistance to creep under high stress, high temperature conditions, particularly up to 2030° F.

The single crystal components made from this invention's compositions can be produced by any of the single crystal casting techniques known in the art. For example, single crystal directional solidification processes can be utilized, such as the seed crystal process and the choke process.

The single crystal castings made from the superalloy of the present invention are advantageously subjected to a high temperature aging heat treatment in order to optimize the creep-rupture properties of these alloys. This invention's single crystal castings can be aged at a temperature of from about 1950° F. to about 2125° F. for about 1 to about 20 hours. Advantageously, this invention's single crystal castings can be aged at a temperature of from about 2050° F. to about 2125° F. for about 1 to about 20 hours. However, as can be appreciated by those skilled in the art, the optimum aging temperature and time for aging depends on the precise composition of the superalloy.

This invention provides superalloy compositions having a unique blend of desirable properties. These properties include: excellent single crystal component castability, particularly for moderately sized blade and vane components; excellent cast component solutionability; excellent resistance to single crystal cast component recrystallization; ultra-high creep-rupture strength to about 2030° F.; extremely good low cycle fatigue strength; extremely good high cycle fatigue strength; high impact strength; very good bare hot corrosion resistance; very good bare oxidation resistance; adequate component coatability; and microstructural stability, such as resistance to formation of the undesirable TCP phases. As noted above, this superalloy has a precise composition with only small permissible variations in any one element if the unique blend of properties is to be maintained.

In order to more clearly illustrate this invention and provide a comparison with representative superalloys outside the claimed scope of the invention, the examples set forth below are presented. The following examples are included as being illustrations of the invention and its relation to other superalloys and articles, and should not be construed as limiting the scope thereof.

EXAMPLES

A large number of superalloy test materials were prepared to investigate the compositional variations and ranges for the superalloys of the present invention. Some of the alloy compositions tested and reported below fall outside the claimed scope of the present invention, but are included for comparative purposes to assist in the understanding of the invention. Representative alloy aim chemistries of those materials tested are reported in Table 1 below.

                                      TABLE 1                                      __________________________________________________________________________                                                    See "Key" Below                 Alloy  C  B Cr Co                                                                               Mo W  Cb                                                                               Ti Al Ta                                                                               Re  Nf Ni Nv38*                                                                              1   2   3   4                   __________________________________________________________________________     CMSX-10A                                                                              -- --                                                                               3.0                                                                               8.5                                                                              .70                                                                               7.2                                                                               .30                                                                              .65                                                                               6.0                                                                               7.6                                                                              5.0 .05                                                                               BAL                                                                               2.08                                                                               12.46                                                                              6.65                                                                               14.55                                                                              20.76               10B    -- --                                                                               2.6                                                                               8.2                                                                              .70                                                                                6.95                                                                             .30                                                                              .68                                                                               6.0                                                                               7.9                                                                              4.95                                                                               .06                                                                               BAL                                                                               2.02                                                                               11.9                                                                               6.68                                                                               14.88                                                                              20.5                10C    -- --                                                                               2.5                                                                               7.7                                                                              .70                                                                               6.6                                                                               .30                                                                              .65                                                                               5.9                                                                               8.2                                                                              4.8 .05                                                                               BAL                                                                               1.90                                                                               11.4                                                                               6.55                                                                               15.05                                                                              20.3                10D    -- --                                                                               4.0                                                                               4.8                                                                              .60                                                                               6.4                                                                               .30                                                                              .60                                                                               5.7                                                                               8.2                                                                              4.9 .03                                                                               BAL                                                                               1.95                                                                               11.3                                                                               6.30                                                                               14.80                                                                              20.1                10E    -- --                                                                               2.2                                                                               7.2                                                                              .70                                                                               6.3                                                                               .25                                                                              .72                                                                               5.85                                                                              8.3                                                                              4.8 .042                                                                              BAL                                                                               1.84                                                                               11.1                                                                               6.57                                                                               15.12                                                                              20.1                10F    .02                                                                               .02                                                                              2.4                                                                               7.6                                                                              .65                                                                                6.45                                                                             .28                                                                              .63                                                                               5.9                                                                               8.5                                                                              5.0 .046                                                                              BAL                                                                               1.89                                                                               11.45                                                                              6.53                                                                               15.31                                                                              20.6                10G    -- --                                                                               2.4                                                                               6.3                                                                              .50                                                                               6.4                                                                               .20                                                                              .70                                                                               5.8                                                                               8.0                                                                              5.5 .04                                                                               BAL                                                                               1.82                                                                               11.9                                                                               6.5 14.7                                                                               20.4                10Ga   -- --                                                                               2.4                                                                               4.0                                                                              .50                                                                               6.2                                                                               .15                                                                              .55                                                                               5.8                                                                               8.3                                                                              5.6 .04                                                                               BAL                                                                               1.72                                                                               11.8                                                                               6.35                                                                               14.8                                                                               20.6                10K-10Gb                                                                              -- --                                                                               2.3                                                                               3.3                                                                              .40                                                                               5.5                                                                               .10                                                                              .30                                                                               5.7                                                                               8.4                                                                              6.3 .03                                                                               BAL                                                                               1.60                                                                               11.8                                                                               6.0 14.5                                                                               20.6                10H    -- --                                                                               2.2                                                                               5.9                                                                              .50                                                                               6.4                                                                               .15                                                                              .80                                                                               5.9                                                                               8.0                                                                              5.5 .04                                                                               BAL                                                                               1.82                                                                               11.9                                                                               6.7 14.85                                                                              20.4                10I    -- --                                                                               2.5                                                                               4.7                                                                              .50                                                                               6.4                                                                               .15                                                                              .70                                                                               5.8                                                                               7.9                                                                              6.0 .04                                                                               BAL                                                                               1.81                                                                               12.4                                                                               6.5 14.65                                                                              20.9                10Ia   -- --                                                                               2.5                                                                               3.3                                                                              .40                                                                               6.1                                                                               .10                                                                              .60                                                                               5.8                                                                               7.9                                                                              6.0 .04                                                                               BAL                                                                               1.69                                                                               12.1                                                                               6.4 14.4                                                                               20.4                10J    .015                                                                              .01                                                                               2.65                                                                             4.0                                                                              .50                                                                               6.0                                                                               .20                                                                              .65                                                                               5.8                                                                               9.0                                                                              5.5 .04                                                                               BAL                                                                               1.79                                                                               11.5                                                                               6.45                                                                               15.65                                                                              21.0                10L    -- --                                                                               2.0                                                                               2.7                                                                              .40                                                                               5.3                                                                               .10                                                                              .20                                                                               5.65                                                                              8.4                                                                              6.3 .03                                                                               BAL                                                                               1.50                                                                               11.6                                                                               5.85                                                                               14.35                                                                              20.4                CMSX-12A                                                                              -- --                                                                               3.0                                                                               4.5                                                                              .35                                                                               5.5                                                                               --                                                                               1.0                                                                               5.65                                                                              9.0                                                                              5.5 .04                                                                               BAL                                                                               1.84                                                                               11.0                                                                               6.65                                                                               15.65                                                                              20.35               12B    -- --                                                                               3.5                                                                               3.0                                                                              .35                                                                               5.0                                                                               --                                                                               .90                                                                               5.60                                                                              8.8                                                                              6.0 .04                                                                               BAL                                                                               1.80                                                                               11.0                                                                               6.5 15.3                                                                               20.15               12C    -- --                                                                               2.8                                                                               3.5                                                                              .40                                                                               5.3                                                                               --                                                                               .73                                                                               5.60                                                                              8.8                                                                              5.8 .04                                                                               BAL                                                                               1.70                                                                               11.1                                                                               6.35                                                                               15.15                                                                              20.3                12D-12Ca                                                                              -- --                                                                               2.5                                                                               3.2                                                                              .45                                                                               4.7                                                                               --                                                                               .50                                                                               5.60                                                                              8.7                                                                              6.3 .03                                                                               BAL                                                                               1.61                                                                               11.0                                                                               6.10                                                                               14.8                                                                               20.15               12E    -- --                                                                               2.0                                                                               3.0                                                                              .45                                                                               4.7                                                                               --                                                                               .40                                                                               5.60                                                                              8.7                                                                              6.3 .03                                                                               BAL                                                                               1.50                                                                               11.0                                                                               6.0 14.7                                                                               20.15               CMSX-10Ri                                                                             -- --                                                                                2.65                                                                             7.0                                                                              .60                                                                               6.4                                                                               .40                                                                              .80                                                                               5.8                                                                               7.5                                                                              5.5 .06                                                                               BAL                                                                               1.91                                                                               11.9                                                                               6.6 14.5                                                                               20.0                CMSX-12Ri                                                                             -- --                                                                               3.4                                                                               8.0                                                                              .50                                                                               6.0                                                                               --                                                                               1.0                                                                               5.6                                                                               7.6                                                                              5.3 .06                                                                               BAL                                                                               1.92                                                                               11.3                                                                               6.6 14.6                                                                               19.4                __________________________________________________________________________      Key:                                                                           1  W + Re                                                                      2  Al + Ti                                                                     3  Al + Ti + Te + Cb                                                           4  W + Re + Mo + Ta                                                            *Calculated using PWA W35 Method                                         

Third generation single crystal alloy development to investigate the compositional variations for the superalloys of the present invention began with the definition and evaluation of a series of experimental compositions. Increased creep-rupture strength was the primary objective of the initial development effort, with elemental balancing to provide a combination of useful engineering characteristics following the definition of a base concept for increased strength.

The initial materials explored the utility of higher levels of refractory element and gamma prime forming elements than are present in similar prior art compositions. As shown in Table 1, the alloy chromium content was reduced to improve alloy stability. Cobalt content, initially thought to be required for increased solid solubility, could be significantly reduced. Refractory element content (W+Re+Mo+Ta) was varied, while the summation of the primary gamma prime partitioning element (Al+Ti+Ta+Cb) was also varied. The alloy's Re content was initially explored at conventional levels, but it was found that the Re level had to be increased.

Standard N_(v3B) calculations were performed during the initial alloy design stage to assist respective alloy phasial stability predictions, with that number varying from one alloy composition to another.

Some of the alloys were produced using production-type procedures. These alloys were vacuum induction melted in the Cannon-Muskegon Corporation V-1 furnace, yielding approximately 200-300 lbs. of bar product per alloy (see Table 2 below). Quantities of each compositional iteration, as reported in Table 2, were made into test bars and test blades by vacuum investment casting. Solution heat treatment procedures were developed in the laboratory in 3" and 6" diameter tube furnaces. Gamma prime aging treatments were also performed in the laboratory.

                                      TABLE 2                                      __________________________________________________________________________     V-1 VIM FURNACE HEAT CHEMISTRIES                                               Alloy  Heat No.                                                                            C  B   Cr  Co  Mo W Cb  Ti  Al Ta                                                                               Re                                                                               Nf  Ni                          __________________________________________________________________________     CMSX-10A                                                                              VF 778                                                                              .001                                                                              <.001                                                                              2.9 8.5 .7 7.2                                                                              .3  .70 6.05                                                                              7.6                                                                              5.0                                                                              .05 BASE                        10B    VF 831                                                                              .002                                                                              <.001                                                                              2.6 8.2 .7 6.9                                                                              .3  .68 6.06                                                                              7.9                                                                              4.9                                                                              .05 BASE                        10Ri   VF 965                                                                              .001                                                                              <.001                                                                              2.65                                                                               7.0 .6 6.4                                                                              .4  .80 5.72                                                                              7.6                                                                              5.5                                                                              .06 BASE                        10Ri   VF 966                                                                              .001                                                                              <.001                                                                              2.67                                                                               7.0 .6 6.3                                                                              .4  .80 5.66                                                                              7.6                                                                              5.4                                                                              .06 BASE                        10Ri   VF 980                                                                              .001                                                                              <.001                                                                              2.66                                                                               7.0 .6 6.3                                                                              .4  .79 5.78                                                                              7.6                                                                              5.4                                                                              .06 BASE                        12Ri   VF 963                                                                              .001                                                                              <.001                                                                              3.3 8.0 .48                                                                               6.0                                                                              <.05                                                                               1.01                                                                               5.69                                                                              7.6                                                                              5.3                                                                              .07 BASE                        12Ri   VF 964                                                                              .001                                                                              <.001                                                                              3.4 8.0 .48                                                                               6.1                                                                              <.05                                                                               1.00                                                                               5.60                                                                              7.6                                                                              5.3                                                                              .04 BASE                        12Ri   VF 979                                                                              .001                                                                              <.001                                                                              3.4 8.0 .50                                                                               6.1                                                                              <.05                                                                               1.00                                                                               3.56                                                                              7.6                                                                              5.3                                                                              .06 BASE                        10Ga   VF 983                                                                              .001                                                                              <.001                                                                              2.4 3.95                                                                               .41                                                                               6.1                                                                              .14 .36 5.83                                                                              8.4                                                                              5.9                                                                              .03 BASE                        12C    VF 985                                                                              .001                                                                              <.001                                                                              2.7 3.5 .45                                                                               5.3                                                                              <.05                                                                               .75 5.66                                                                              8.8                                                                              6.0                                                                              .025                                                                               BASE                        10Cb (-10K)                                                                           VF 994                                                                              .001                                                                              <.001                                                                              2.2 3.3 .40                                                                               5.3                                                                              .09 .24 5.74                                                                              8.2                                                                              6.4                                                                              .025                                                                               BASE                        12Ca (-12D)                                                                           VF 993                                                                              .001                                                                              <.001                                                                              2.4 3.2 .46                                                                               4.8                                                                              <.01                                                                               .50 5.64                                                                              8.6                                                                              6.4                                                                              .025                                                                               BASE                        __________________________________________________________________________

All other specimens reported in Table 1 above were produced by blending base alloy bar stock with the virgin elemental additions necessary to achieve the desired composition. The blending was done during test bar and blade manufacture. The base alloy bar stock plus virgin additions were placed into the casting furnace melt crucible, melted and the bath homogenized prior to pouring into an appropriate shell mold. It is believed that good correlation between alloy aim chemistry and test bar/blade chemistry was routinely achieved (see Table 3 below).

                                      TABLE 3                                      __________________________________________________________________________     ALLOY TEST BAR CHEMISTRIES                                                     Alloy C  B  Cr  Co                                                                               Mo W   Cb  Ti                                                                               Al  Ta                                                                               Re                                                                               Hf Ni Nv3B*                             __________________________________________________________________________     CMSX-10A                                                                             -- -- 2.9 8.5                                                                              .68                                                                               7.4 .29 .69                                                                              6.0 7.5                                                                              5.1                                                                              .07                                                                               BAL                                                                               2.09                              10B   -- -- 2.7 8.1                                                                              .69                                                                               6.95                                                                               .29 .69                                                                              6.0 7.8                                                                              4.8                                                                              .06                                                                               BAL                                                                               2.01                              10C   -- -- 2.6 7.7                                                                              .69                                                                               6.4 .30 .62                                                                              5.7 8.3                                                                              4.7                                                                              .07                                                                               BAL                                                                               1.86                              10D   -- -- 4.0 5.0                                                                              .62                                                                               6.0 .31 .59                                                                              5.44                                                                               8.1                                                                              4.7                                                                              .04                                                                               BAL                                                                               1.83                              10E   -- -- 2.2 7.2                                                                              .70                                                                               6.4 .26 .63                                                                              5.89                                                                               8.2                                                                              4.8                                                                              .05                                                                               BAL                                                                               1.84                              10F   .014                                                                              .027                                                                              2.4 7.7                                                                              .65                                                                               6.4 .28 .63                                                                              5.96                                                                               7.9                                                                              5.0                                                                              .04                                                                               BAL                                                                               1.86                              10G   -- -- 2.5 6.5                                                                              .53                                                                               5.5 .20 .68                                                                              5.6 8.2                                                                              4.6                                                                              .05                                                                               BAL                                                                               1.68                              10Ga  -- -- 2.4 4.0                                                                              .41                                                                               6.2 .14 .55                                                                              5.79                                                                               8.3                                                                              6.0                                                                              .025                                                                              BAL                                                                               1.73                              10Cb (10K)                                                                           -- -- 2.3 3.5                                                                              .42                                                                               5.9 .10 .43                                                                              5.67                                                                               8.5                                                                              6.0                                                                              .024                                                                              BAL                                                                               1.63                              10N   -- -- 2.3 5.6                                                                              .51                                                                               6.2 .17 .76                                                                              5.58                                                                               7.8                                                                              5.4                                                                              .05                                                                               BAL                                                                               1.69                              10I   -- -- 2.6 4.8                                                                              .52                                                                               6.6 .14 .67                                                                              5.65                                                                               7.4                                                                              5.4                                                                              .04                                                                               BAL                                                                               1.70                              10Ia  -- -- 2.7 3.5                                                                              .47                                                                               5.2 .10 .60                                                                              5.80                                                                               8.0                                                                              5.8                                                                              .04                                                                               BAL                                                                               1.67                              10J   .017                                                                              .10                                                                               2.6 4.0                                                                              .48                                                                               6.0 .19 .62                                                                              5.74                                                                               8.8                                                                              5.7                                                                              .04                                                                               BAL                                                                               1.76                              10L   -- -- 1.9 2.7                                                                              .41                                                                               5.4 .10 .22                                                                              5.68                                                                               8.4                                                                              6.2                                                                              .03                                                                               BAL                                                                               1.49                              12A   -- -- 3.0 4.6                                                                              .39                                                                               5.3 <.01                                                                               .96                                                                              5.61                                                                               9.4                                                                              5.0                                                                              .05                                                                               BAL                                                                               1.80                              12B   -- -- 3.5 3.0                                                                              .38                                                                               5.1 <.01                                                                               .84                                                                              5.52                                                                               8.8                                                                              6.1                                                                              .05                                                                               BAL                                                                               1.79                              12C   -- -- 2.7 3.5                                                                              .45                                                                               5.4 <.01                                                                               .75                                                                              5.62                                                                               8.8                                                                              6.0                                                                              .04                                                                               BAL                                                                               1.72                              12Ca (12D)                                                                           -- -- 2.5 3.2                                                                              .46                                                                               5.0 <.01                                                                               .61                                                                              5.56                                                                               8.7                                                                              6.0                                                                              .03                                                                               BAL                                                                               1.60                              12E   -- -- 2.0 3.0                                                                              .45                                                                               4.7 <.01                                                                               .40                                                                              5.63                                                                               8.7                                                                              6.3                                                                              .02                                                                               BAL                                                                               1.51                              10Ri  -- -- 2.65                                                                               7.0                                                                              .60                                                                               6.4 .40 .80                                                                              5.67                                                                               7.6                                                                              5.5                                                                              .065                                                                              BAL                                                                               1.87                              12Ri  -- -- 3.4 8.0                                                                              .48                                                                               6.1 <.01                                                                               .99                                                                              5.54                                                                               7.6                                                                              5.3                                                                              .07                                                                               BAL                                                                               1.92                              __________________________________________________________________________      *PWA N35 Method                                                          

For the CMSX-10D specimen (see Table 1), high quality virgin elemental additions were vacuum melted and the refined material was poured into 2" diameter bars. In turn, a quantity of the resulting bar was used to produce single crystal test bar/blade specimens by investment casting.

It was apparent that considerable variation in the investment casting process integrity may have occurred during specimen manufacture since varying levels of test bar freckle formation, secondary dendrite arm spacing and property attainment were apparent. Derivative alloy response to solution treatment (reported in Table 4 below) varied, and was a function of both alloy composition and test specimen quality.

Heat treatments developed for the alloy iterations are reported in Table 4 below. Full gamma prime solutioning was desired for each material, however, this objective was not universally achieved. Primary gamma prime aging was performed to effect a more desirable gamma prime particle size and distribution. Secondary gamma prime aging was performed to effect precipitation of conventional matrix gamma prime precipitates along with ultra-fine gamma prime precipitates located within the matrix channels between the primary gamma prime particles for these specimens.

                                      TABLE 4                                      __________________________________________________________________________     Heat Treatment Detail                                                                 Peak Solution Temperature                                               Alloy  °F.                                                                            °C.                                                                            % γ" Solutioned*                                                                  Primary γ' Aging+                                                                  Secondary γ' Aging+              __________________________________________________________________________     CMSX-10A                                                                              2460   1349   97.0-98.0                                                                               1975° F./4 Hrs                                                                    1600° F./20 + 1400°                                              F./24                                  10B    2465   1352   97.0-98.0                                                                               1975° F./4 Hrs                                                                    1600° F./20 + 1400°                                              F./24                                                                1975° F/19.5 Hrs                          10C    2470   1354   99.0-99.5                                                                               2100° F./8 Hrs                                                                    1600° F./20 + 1400°                                              F./24                                                                1975° F./10 Hrs                           10D    2450   1343   99.9-100 1975° F./10 Hrs                                                                   1600° F./22 + 1400°                                              F./24                                  10E    2465   1352   100      1975° F./15 Hrs                                                                   1600° F./20 + 1400°                                              F./24                                                                1975° F./21 Hrs                                                                   1600° F./25.5                                                           + 1400° F./23                   10F    2444   1340   95       1975° F./16 Hrs                                                                   1600° F./23 + 1400°                                              F./24                                  10G    2475   1357   99.0-99.5                                                                               1975° F./12 Hrs                                                                   1600° F./24.5                                                           + 1400° F./17                   10Ga   2485-90                                                                               1363-65                                                                               99.5-100 2075° F./5 Hrs                                                                    1600° F./20 + 1400°                                              F./23                                                                2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                                                          1612° F./48 + 1414°                                              F./22                                  10Gb(10K)                                                                             2485   1363   100      2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  10H    2475   1357   98.5-99.0                                                                               1975° F./16 Hrs                                                                   1600° F./27.5                                                           + 1400° F./27                                                 1975° F./18 Hrs                                                                   1600° F./101                                                            + 1400° F./46                   10I    2475   1357   100      2075° F./5 Hrs                                                                    1600° F./22 + 1405°                                              F./24                                  10Ia   2480   1360   99.5-100 2075° F./5 Hrs                                                                    1600° F./24 + 1400°                                              F./24                                  10J    2480   1360   98.0-99.0                                                                               1975° F./15 Hrs                                                                   1600° F./24 + 1400°                                              F./30                                                                2075° F./5 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  10L    2490   1365   100      2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  12A    2475   1357   98.5-99.0                                                                               1975° F./16.5 Hrs                                                                 1600° F./24 + 1400°                                              F./32                                                                1975° F./12 Hrs                                                                   1600° F./24 + 1400°                                              F./27.5                                12B    2480   1360   99.0-99.5                                                                               1975° F./13 Hrs                                                                   1600° F./57 + 1400°                                              F./39                                  12C    2485-90                                                                               1363-65                                                                               99.5-100 2075° F./5 Hrs                                                                    1600° F./20 + 1400°                                              F./5                                                                 2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  12Ca(12D)                                                                             2485   1363   100      2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  12E    2490   1365   100      2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  10Ri   2460   1349   98.5-99.8                                                                               2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  12Ri   2455   1346   100      2075° F./6 Hrs                                                                    1600° F./24 + 1400°                                              F./30                                  __________________________________________________________________________      *Determined by visual estimation                                               + Specimens air cooled from all aging treatments                         

Fully heat treated test bars were creep-rupture tested. The specimens were machined and low-stress ground to ASTM standard proportional specimen dimension. The specimens were creep-rupture tested at various conditions of temperature and stress, according to standard ASTM procedure.

A significant factor of the CMSX-10A alloy design was the shift to higher Re content. At the same time, W, Cr, Ta and other gamma prime strengtheners were balanced to provide the desired alloy characteristics and properties. The alloys higher Re level resulted in significantly improved creep-rupture strength throughout the entire test regime, as indicated by the results reported in Table 5 below for the CMSX-10A specimen.

                                      TABLE 5                                      __________________________________________________________________________     CMSX-10A CREEP-RUPTURE                                                                                                     TIME IN HOURS                                 RUPTURE TIME                                                                             %    %  FINAL CREEP READING                                                                           TO REACH                           TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                              % deformation                                                                          1.0% 2.0%                          __________________________________________________________________________     1600° F./75.0 ksi                                                                  534.4     24.2 26.9                                                                              534.2  22.331  10.9 21.0                                     328.4     22.0 27.8                                                                              328.3  21.055  6.3  8.7                                      527.3     21.1 26.3                                                                              526.3  17.552  28.4 72.2                          1700° F./50.0 ksi                                                                  305.0     31.1 34.5                                                                              304.2  28.614  62.1 108.9                                    292.4     19.2 19.9                                                                              291.8  19.324  71.5 123.7                                    87.6      2.6  5.8                                                                               85.7   1.474   65.9 --                            1800° F./30.0 ksi                                                                  415.6     16.1 21.4                                                                              413.8  15.643  182.7                                                                               246.1                                    848.0     37.1 33.0                                                                              846.3  34.326  460.4                                                                               524.3                                    1016.2    33.2 30.5                                                                              1014.3 32.984  476.8                                                                               655.1                         1800° F./36.0 ksi                                                                  586.5     38.1 38.0                                                                              585.6  33.050  395.0                                                                               425.0                                    572.7     36.9 35.3                                                                              570.7  29.029  395.0                                                                               422.0                                    546.5     26.4 34.2                                                                              545.7  25.843  373.0                                                                               406.0                                    420.3     22.4 26.3                                                                              418.7  18.105  286.7                                                                               317.6                                    426.0     14.8 17.0                                                                              425.1  10.244  326.5                                                                               353.2                                    239.8     24.3 23.8                                                                              239.7  23.264  94.1 123.9                                    255.7     19.9 27.4                                                                              253.6  18.510  115.2                                                                               152.7                         1900° F./25.0 ksi                                                                  32.3      5.5  11.0                                                                              31.0   2.075   26.7 30.7                                     129.7     43.2 38.9                                                                              128.7  39.556  30.4 48.1                                     168.7     34.7 36.4                                                                              166.1  30.816  58.2 78.4                                     228.1     18.1 32.3                                                                              226.4  16.926  146.3                                                                               160.6                                    277.7     29.5 31.1                                                                              276.4  27.323  9.9  29.9                                     423.4     39.7 38.3                                                                              422.7  35.121  218.4                                                                               250.9                                    383.8     35.9 36.1                                                                              382.7  34.861  192.9                                                                               226.7                                    373.3     31.3 35.7                                                                              371.6  26.138  211.6                                                                               238.0                         2000° F./18.0 ksi                                                                  138.0     22.3 33.0                                                                              136.3  19.052  33.9 77.0                                     134.9     40.7 36.5                                                                              134.7  38.328  54.7 71.9                                     122.9     23.2 34.9                                                                              122.0  19.050  50.1 69.4                                     115.6     34.2 36.6                                                                              114.4  30.861  40.8 56.8                                     245.2     35.1 36.2                                                                              244.3  29.844  135.7                                                                               157.9                                    221.9     36.3 35.4                                                                              221.8  33.737  113.0                                                                               140.0                                    818.2     32.1 34.2                                                                              180.1  29.249  53.1 61.4                          2050° F./15.0 ksi                                                                  126.4     47.9 49.0                                                                              124.1  30.086  45.8 69.8                                     150.5     45.5 47.8                                                                              148.1  39.308  16.8 34.5                                     140.5     30.6 40.0                                                                              138.7  23.596  30.6 76.4                                     120.8     29.5 39.7                                                                              120.0  29.479  16.3 55.6                                     79.0      11.7 14.4                                                                              79.0   11.644  41.7 54.8                                     112.2     24.3 31.3                                                                              112.1  21.401  55.9 69.5                          2100° F./12.5 ksi                                                                  94.1      22.1 27.5                                                                              94.1   20.520  42.2 62.6                                     112.5     39.4 33.1                                                                              112.2  29.126  28.0 58.8                                     96.6      25.9 35.9                                                                              95.5   14.542  52.3 62.5                                     123.6     43.4 40.4                                                                              122.9  31.050  40.9 63.5                                     50.8      21.7 29.6                                                                              49.9   9.330   35.1 37.6                                     90.5      41.6 43.7                                                                              89.7   37.422  13.6 38.5                          1800° F./36.0 ksi*                                                                 420.6     23.9 35.1                                                                              419.9  23.196  213.8                                                                               286.0                                    396.1     37.1 34.0                                                                              394.7  31.623  239.4                                                                               264.9                                    384.9     31.1 34.0                                                                              382.9  25.554  220.5                                                                               247.9                         __________________________________________________________________________      *As-Solutioned Condition                                                 

Microstructural review of the failed rupture specimens of this alloy revealed that TCP phase precipitation occurred during the respective creep-rupture tests, particularly those at 1900° F. and above. It became apparent that the N_(V3B) phasial stability number calculation would be an effective tool in predicting alloy stability and, effectively, high temperature creep strength for the invention.

Wherein the CMSX-10A specimen's N_(V3B) number was 2.08, CMSX-10B was designed to the 2.02 level. This was accomplished by the further reduction of alloy Cr content and similar reduction to Co and W+Re level. W was reduced more than the Re in this specimen since Re is more effective in the solid solution. Additionally, wherein some loss in W contribution to the gamma prime could be anticipated, it was sufficiently replaced by the modest increase to Ta content in this composition. These changes resulted in the CMSX-10B alloy specimen exhibiting even more improved creep strength at 1800° F. Table 6 reported below illustrates that three specimens achieved an average life of 961 hours, with 1.0% creep occurring at an average of 724 hours. However, it was observed that TCP phase was present at higher temperature.

                                      TABLE 6                                      __________________________________________________________________________     CMSX-10B CREEP-RUPTURE                                                                                                     TIME IN HOURS                                 RUPTURE TIME                                                                             %    %  FINAL CREEP READING                                                                           TO REACH                           TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                              % deformation                                                                          1.0% 2.0%                          __________________________________________________________________________     1800° F./36.0 ksi                                                                  907.1     19.2 34.0                                                                              907.0  17.832  697.2                                                                               752.7                                    989.3     18.9 33.5                                                                              968.5  17.657  768.1                                                                               817.8                                    968.4     35.9 36.1                                                                              967.3  31.813  705.8                                                                               767.5                                    507.0     44.1 45.4                                                                              505.7  41.548  317.9                                                                               352.6                                    598.1     46.9 43.4                                                                              596.1  42.340  386.5                                                                               415.2                                    408.3     62.6 52.1                                                                              407.2  54.479  187.3                                                                               256.5                                    265.3     39.7 43.7                                                                              262.7  37.102  87.6 119.2                                    385.3     45.5 46.2                                                                              383.5  39.031  177.4                                                                               213.4                                    412.8     43.4 40.5                                                                              410.6  38.771  189.1                                                                               233.4                                    389.3     51.5 44.2                                                                              386.8  36.920  220.5                                                                               249.2                                    459.5     40.0 46.3                                                                              458.0  39.513  210.2                                                                               291.1                                    258.0     38.1 40.6                                                                              257.9  36.743  32.1 90.2                                     484.1     27.9 40.0                                                                              483.4  26.296  288.1                                                                               326.7                                    376.9     16.4 20.4                                                                              376.8  16.088  96.0 226.6                                    481.0     50.5 48.2                                                                              478.8  34.557  264.4                                                                               297.5                                    461.5     35.1 40.6                                                                              460.1  30.786  181.1                                                                               265.3                                    483.0     47.1 46.8                                                                              482.1  43.714  286.2                                                                               320.7                                    500.1     33.4 37.0                                                                              499.7  30.486  11.9 280.1                         1800° F./40 ksi                                                                    436.7     40.2 44.1                                                                              436.2  39.818  294.6                                                                               318.9                                    390.8     50.1 42.8                                                                              390.3  41.817  250.9                                                                               376.2                                    336.9     52.7 48.1                                                                              335.2  46.697  226.5                                                                               240.9                         1900° F./25.0 ksi                                                                  237.8     55.9 45.7                                                                              237.4  53.834  33.0 113.5                                    295.7     57.4 49.1                                                                              295.6  46.592  123.7                                                                               170.9                         2000° F./18.0 ksi                                                                  192.7     31.5 26.6                                                                              191.6  27.733  56.3 88.6                                     166.5     41.4 25.3                                                                              166.5  34.102  46.2 72.7                                     173.3     36.6 27.0                                                                              171.4  31.481  24.0 66.1                          2050° F./15.0 ksi                                                                  219.6     40.1 40.4                                                                              218.6  37.871  13.2 56.8                                     122.3     28.2 47.9                                                                              120.6  26.614  37.0 63.7                                     118.4     33.2 60.0                                                                              116.9  29.986  36.7 56.5                                     179.7     44.1 48.1                                                                              179.1  39.188  8.4  75.3                                     74.9      44.2 48.6                                                                              74.6   34.800  6.8  14.5                                     168.3     48.6 49.7                                                                              167.0  43.171  36.9 77.1                                     104.8     17.0 27.2                                                                              102.8  1.626   66.1 --                                       155.9     46.3 49.8                                                                              155.2  38.388  64.4 81.9                                     90.6      15.1 21.4                                                                              87.1   1.046   75.5 --                                       120.5     46.3 55.8                                                                              118.7  35.143  10.3 27.7                                     150.7     39.8 49.7                                                                              150.1  33.903  21.4 60.9                                     149.5     33.2 46.2                                                                              148.9  23.166  73.3 88.3                                     142.9     42.0 47.5                                                                              142.5  41.524  54.9 70.5                          2050° F./15.0 ksi                                                                  163.0     52.5 49.2                                                                              161.9  46.146  20.5 76.9                                     151.1     66.4 45.6                                                                              150.7  59.115  52.7 75.5                                     131.8     57.3 44.4                                                                              131.5  48.310  26.3 57.1                                     *156.0    54.4 41.0                                                                              155.9  45.502  55.5 78.3                                     *133.7    57.2 56.0                                                                              132.7  41.753  67.5 80.7                                     *135.1    59.7 52.3                                                                              134.3  46.317  54.9 71.5                                     151.1     66.4 45.6                                                                              150.7  59.115  52.7 75.5                                     131.8     57.3 44.4                                                                              131.5  48.310  26.3 57.1                          2100° F./15.0 ksi                                                                  69.7      54.2 48.1                                                                              69.4   47.674  25.3 36.3                          __________________________________________________________________________      *As-Solutioned Condition                                                 

Only about 97-98% gamma prime solutioning was achieved in the CMSX-10A and -10B materials (see Table 4) which was insufficient for the purpose of optimizing alloy mechanical properties and microstructural homogeneity. Attainment of a greater level of gamma prime solutioning, therefore, became an equal priority in tandem with improving microstructural stability at temperatures above 1900° F.

To confirm the suspected composition of the TCP phase forming in the alloys, scanning electron microscope (SEM) wavelength dispersive x-ray (WDX) microchemistry analyses of CMSX-10B test bar contained needles was undertaken and compared to the alloys gamma and gamma prime compositions. The results, reported in Table 7 below, confirm that the needles were enriched in Cr, W and Re.

                                      TABLE 7                                      __________________________________________________________________________     CMSX-10B Micro-Chemistry Analyses                                              Cast Test Bar (VF 831)                                                         Transverse Section. Bottom Bar Location.                                       Solutioned to 2465° F.                                                  Aged 1975° F./19.5 Mrg./AC                                              1600° F./20 Mrs./AC                                                     1400° F./24 Mrg./AC                                                     __________________________________________________________________________                          GAMMA            NEEDLE                                   GAMMA PHASE          PRIME PHASE      CONSTITUENT                              ELEM                                                                               K   Z  A  F  ELEM                                                                               K   Z  A  F  ELEM                                                                               K   Z  A  F                              __________________________________________________________________________     ALK 0.0101                                                                             1.090                                                                             0.324                                                                             1.000                                                                             ALK 0.0145                                                                             1.084                                                                             0.322                                                                             1.000                                                                             ALK 0.0116                                                                             1.107                                                                             0.347                                                                             1.000                          TIK 0.0069                                                                             1.007                                                                             0.930                                                                             1.051                                                                             TIK 0.0084                                                                             1.002                                                                             0.934                                                                             1.052                                                                             TIK 0.0077                                                                             1.026                                                                             0.908                                                                             1.039                          CRK 0.0428                                                                             1.008                                                                             0.963                                                                             1.108                                                                             CRK 0.0250                                                                             1.002                                                                             0.965                                                                             1.117                                                                             CRK 0.0390                                                                             1.028                                                                             0.949                                                                             1.083                          COK 0.0970                                                                             0.994                                                                             0.984                                                                             1.018                                                                             COC 0.0761                                                                             0.988                                                                             0.987                                                                             1.022                                                                             COK 0.0755                                                                             1.016                                                                             0.977                                                                             1.025                          NIK 0.6891                                                                             1.033                                                                             0.988                                                                             1.010                                                                             NIK 0.7270                                                                             1.026                                                                             0.991                                                                             1.005                                                                             NIK 0.6143                                                                             1.056                                                                             0.983                                                                             1.024                          TAL 0.0485                                                                             0.794                                                                             1.020                                                                             1.000                                                                             TAL 0.0697                                                                             0.788                                                                             1.024                                                                             1.000                                                                             TAL 0.0389                                                                             0.814                                                                             1.018                                                                             1.000                          W L 0.0329                                                                             0.788                                                                             0.963                                                                             1.000                                                                             W L 0.0311                                                                             0.783                                                                             0.962                                                                             1.000                                                                             W L 0.0682                                                                             0.808                                                                             0.968                                                                             1.000                          REL 0.0422                                                                             0.785                                                                             0.968                                                                             1.000                                                                             REL 0.0085                                                                             0.779                                                                             0.968                                                                             1.000                                                                             REL 0.1083                                                                             0.805                                                                             0.973                                                                             1.000                          __________________________________________________________________________                WT %             WT %              WT %                             ELEM CPS   ELEM ELEM  CPS   ELEM ELEM  CPS    ELEM                             __________________________________________________________________________     AL K 12.1800                                                                              2.87 AL K  17.9400                                                                              4.19 AL K  11.9900                                                                               3.02                             TI K 5.5200                                                                               0.71 TI K  6.8400                                                                               0.86 TI K  5.2500 0.79                             CR K 27.6400                                                                              3.98 CR K  16.4500                                                                              2.31 CR K  21.5800                                                                               3.69                             CO K 40.6800                                                                              9.74 CO K  32.5400                                                                              7.64 CO K  27.1700                                                                               7.42                             NI K 253.1300                                                                             66.84                                                                               NI K  272.3800                                                                             71.11                                                                               NI K  193.7500                                                                              57.84                            TA L 6.5667                                                                               5.99 TA L  9.6329                                                                               8.64 TA L  4.5259 4.70                             W L  4.0775                                                                               4.33 W L   3.9375                                                                               4.13 W L   7.2620 8.71                             RE L 4.6000                                                                               5.56 RE L  0.9500                                                                               1.13 RE L  10.1300                                                                               13.82                            TOTAL      100.00                                                                              TOTAL       100.00                                                                              TOTAL        100.00                           __________________________________________________________________________

The calculated N_(V3B) numbers were 1.90 for CMSX-10C and 1.95 for CMSX-10D. Re was maintained at around 5% while W was further reduced to improve stability in these specimens. Alloy Ta was increased since it did not participate in TCP formation and the Ta/W ratio was effectively improved, which assisted with alloy castability. Chromium was reduced in the -10C specimens but increased to 4.0% in the -10D specimens to provide an opportunity to determine the suitability of the Cr levels from a hot corrosion standpoint. Co was reduced in both materials, significantly in the -10D specimen, while Al+Ti level was also reduced to assist in achieving more complete gamma prime solutioning. Creep-rupture results for the two specimens are reported below in Tables 8 and 9, respectively. Even though the -10D alloy specimens were observed to exhibit full gamma prime solutioning (as opposed to 99.-99.5% for CMSX-10C) the alloys greater Cr content, which necessitated a lower Al+Ti level, effected lower properties than attained with CMSX-10C. However, both materials exhibited improved alloy stability and higher temperature properties, so that attempts to balance the alloys low and high temperature creep response were favorable.

                                      TABLE 8                                      __________________________________________________________________________     CMSX-10C CREEP-RUPTURE                                                                                                     TIME IN HOURS                                 RUPTURE TIME                                                                             %    %  FINAL CREEP READING                                                                           TO REACH                           TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                              % deformation                                                                          1.0% 2.0%                          __________________________________________________________________________     1800° F./36.0 ksi                                                                  556.1     31.4 30.5                                                                              555.2  26.615  316.1                                                                               376.3                                    636.6     43.9 37.5                                                                              636.4  38.460  416.6                                                                               455.4                                    609.2     23.3 34.7                                                                              607.6  19.074  410.6                                                                               460.6                                    635.7     44.9 45.6                                                                              635.3  34.991  407.3                                                                               443.4                                    612.8     43.5 38.8                                                                              611.9  41.951  409.8                                                                               438.7                         1850° F./36.0 ksi                                                                  252.2     30.2 37.8                                                                              252.0  22.033  61.1 166.3                                    298.1     41.3 39.0                                                                              297.6  37.953  170.3                                                                               194.8                                    231.1     33.6 39.5                                                                              230.2  29.689  127.8                                                                               146.0                         1922° F./20.3 ksi                                                                  492.4     52.5 52.4                                                                              491.6  48.922  176.5                                                                               251.7                                    529.8     38.6 45.5                                                                              528.9  33.353  269.6                                                                               306.2                                    637.5     48.9 43.3                                                                              635.2  45.804  189.5                                                                               318.3                         2000° F./18.0 ksi                                                                  258.8     35.0 41.5                                                                              258.7  32.444  74.2 127.5                                    293.1     49.2 44.1                                                                              292.1  42.079  145.6                                                                               170.9                                    221.9     43.0 48.5                                                                              220.9  33.507  55.6 123.3                                    266.1     35.1 44.0                                                                              264.6  33.759  113.6                                                                               143.6                         2050° F./15.0 ksi                                                                  196.6     39.7 40.3                                                                              194.1  27.755  26.0 134.8                                    170.4     30.1 46.3                                                                              169.2  25.624  11.1 51.4                                     193.2     38.1 42.9                                                                              191.9  32.288  46.5 76.5                          __________________________________________________________________________

                                      TABLE 9                                      __________________________________________________________________________     CMSX-10D CREEP-RUPTURE                                                                                                     TIME IN HOURS                                 RUPTURE TIME                                                                             %    %  FINAL CREEP READING                                                                           TO REACH                           TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                              % deformation                                                                          1.0% 2.0%                          __________________________________________________________________________     1800° F./36.0 ksi                                                                  428.0     26.7 29.3                                                                              426.3  24.166  189.2                                                                               248.3                         11850° F./36.0 ksi                                                                 141.0     23.1 26.8                                                                              140.1  20.660  57.8 79.7                                     140.7     14.7 26.1                                                                              140.2  13.741  56.2 77.6                                     166.0     17.5 28.9                                                                              165.0  15.640  76.5 100.1                         1922° F./20.3 ksi                                                                  519.9     23.8 24.9                                                                              518.9  22.608  202.0                                                                               345.6                                    667.0     17.6 23.7                                                                              665.2  16.819  151.8                                                                               391.4                                    680.3     14.9 28.2                                                                              678.9  14.476  340.2                                                                               500.3                         2000° F./18.0 ksi                                                                  370.3     18.8 21.3                                                                              369.9  15.560  20.9 106.9                                    401.5     11.1 18.0                                                                              400.0  8.903   19.8 125.5                                    366.6     17.5 25.8                                                                              366.6  8.049   223.9                                                                               306.1                         2050° F./15.0 ksi                                                                  465.3     12.9 20.5                                                                              465.2  12.639  61.0 305.9                                    338.8     9.8  24.8                                                                              337.7  9.468   30.8 204.4                         __________________________________________________________________________

The acceptability of the alloys' low Cr content was confirmed through extremely aggressive short-term burner rig hot corrosion tests performed at 1650° F., 1% sulfur, 10 ppm sea salt condition. FIGS. 1 and 2 illustrate the results for tests performed to 117 and 144 hours for the CMSX-10C and CMSX-10D specimens, respectively. In both cases, the materials performed similar to MAR M 247-type materials, thereby confirming the suitability of the low Cr alloy design concept.

With the above-noted results, another series of alloys, CMSX-10E, -10F, -10G, -10H, -10I, and -12A were designed, produced and evaluated. The alloys explored Re level ranging 4.8-6.3%, 2.2-3.0% Cr level, 4.7-7.6% Co level and the remainder balanced to maintain castability, improve solutionability end improve phasial stability. The N_(v3B) number ranged between 1.81-1.89.

One of the series, CMSX-10F, contained 0.02% C and 0.02% B. These additions were observed to improve casting yield and may have assisted in providing more consistent control of single crystal cast article orientation. However, the melting point depressants, C and B, restricted the specimen's response to solution heat treatment. The CMSX-10F creep-rupture properties are reported in Table 10 below.

                                      TABLE 10                                     __________________________________________________________________________     CMSX-10F CREEP-RUPTURE                                                                                                     TIME IN HOURS                                 RUPTURE TIME                                                                             %    %  FINAL CREEP READING                                                                           TO REACH                           TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                              % deformation                                                                          1.0% 2.0%                          __________________________________________________________________________     1800° F./36.0 ksi                                                                  616.0     18.1 22.4                                                                              615.8  16.898  439.9                                                                               477.6                                    666.6     45.6 48.0                                                                              666.4  43.261  464.6                                                                               492.3                                    603.1     25.3 24.3                                                                              602.5  24.281  398.4                                                                               444.0                         1850° F./36.0 ksi                                                                  243.9     19.6 28.2                                                                              243.0  18.045  129.1                                                                               160.9                                    285.9     26.8 32.1                                                                              285.5  25.701  187.8                                                                               206.0                                    258.6     19.2 29.1                                                                              258.3  18.175  168.3                                                                               189.5                         1922° F./20.3 ksi                                                                  499.5     40.0 41.0                                                                              498.5  37.756  208.2                                                                               272.6                                    649.2     55.6 52.9                                                                              648.3  51.045  197.6                                                                               338.8                                    361.0     15.8 21.9                                                                              357.7  2.599   273.2                                                                               335.7                         2000° F./18.0 ksi                                                                  233.4     39.6 51.7                                                                              233.4  37.881  100.8                                                                               133.2                                    276.1     43.7 52.8                                                                              274.4  36.762  115.1                                                                               155.9                                    290.0     36.7 47.3                                                                              289.1  33.304  125.3                                                                               162.1                         2050° F./15.0 ksi                                                                  255.4     28.7 36.6                                                                              255.0  27.426  67.4 131.0                                    255.1     33.4 43.1                                                                              254.4  23.737  50.9 118.7                         __________________________________________________________________________

The CMSX-10E, G, H and I, plus CMSX-12A creep-rupture specimen results are reported below in Tables 11, 12, 13, 14, and 15, respectively. The results show a general improvement to alloy creep-rupture strength above 1900° F. while maintaining extremely good strength at lower temperatures.

                                      TABLE 11                                     __________________________________________________________________________     CMSX-10E CREEP-RUPTURE                                                                                      FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  664.5     31.4 36.3                                                                              663.5                                                                               30.435  436.5                                                                               470.8                                      604.4     35.1 36.7                                                                              603.3                                                                               33.371  253.7                                                                               355.9                                      582.5     41.5 36.1                                                                              581.7                                                                               39.792   78.9                                                                               329.3                                      553.5     35.9 37.0                                                                              552.5                                                                               33.172  326.4                                                                               357.1                           1850° F./36.0 ksi                                                                  237.9     29.3 32.0                                                                              257.0                                                                               22.734  149.4                                                                               170.3                                      199.2     18.4 32.1                                                                              198.6                                                                               16.261  122.4                                                                               139.4                                      260.5     33.6 33.4                                                                              259.7                                                                               31.315  139.9                                                                               174.0                           1922° F./20.3 ksi                                                                  810.6     36.6 33.0                                                                              on.4 33.323  210.2                                                                               378.2                                      800.9     35.3 36.4                                                                              799.1                                                                               32.405  339.7                                                                               434.2                                      839.9     39.0 33.4                                                                              859.6                                                                               37.036  364.6                                                                               465.2                           2000° F./18.0 ksi                                                                  362.8     27.7 29.3                                                                              362.4                                                                               24.887   98.4                                                                               177.3                                      411.2     29.4 27.0                                                                              409.9                                                                               26.426  173.6                                                                               215.6                                      369.7     15.3 28.2                                                                              368.8                                                                               12.941  170.3                                                                               221.9                                      379.7     26.4 26.1                                                                              379.2                                                                               27.656  177.9                                                                               206.6                           2050° F./15.0 ksi                                                                  476.9     21.8 23.4                                                                              476.3                                                                               18.233  196.6                                                                               255.9                                      418.4     27.5 24.7                                                                              417.5                                                                               25.854  180.0                                                                               227.3                                      397.7     19.0 23.8                                                                              396.8                                                                               17.522  112.6                                                                               198.2                           __________________________________________________________________________

                                      TABLE 12                                     __________________________________________________________________________     CMSX-10G CREEP-RUPTURE                                                                                      FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1700° F./55.0 ksi                                                                  671.8     19.6 28.6                                                                              670.5                                                                               14.775  447.2                                                                               508.1                                      693.6     26.0 24.2                                                                              691.7                                                                               21.750  441.2                                                                               493.4                                      724.9     23.3 29.7                                                                              723.2                                                                               19.913  464.8                                                                               520.4                                      582.5     18.6 20.1                                                                              581.1                                                                               15.200  77.0 356.7                                      681.2     20.9 24.1                                                                              679.2                                                                               19.115  65.4 314.8                                      538.4     21.6 17.5                                                                              538.3                                                                               17.837  242.1                                                                               308.7                                      523.0     17.7 21.8                                                                              522.4                                                                               14.157  234.3                                                                               308.0                                      569.7     17.5 19.8                                                                              568.5                                                                               15.035  287.0                                                                               354.9                           1800° F./36.0 ksi                                                                  773.2     29.6 29.3                                                                              773.8                                                                               28.826  315.0                                                                               539.9                                      719.7     29.5 28.5                                                                              717.8                                                                               27.266  321.2                                                                               486.4                                      741.6     28.0 25.9                                                                              740.3                                                                               24.870  284.5                                                                               464.2                                      682.8     45.6 34.7                                                                              681.1                                                                               39.289  409.1                                                                               452.4                                      764.0     23.2 33.7                                                                              764.0                                                                               22.884  543.6                                                                               586.6                                      790.4     41.4 35.6                                                                              789.4                                                                               38.172  511.6                                                                               565.3                                      799.1     27.0 32.3                                                                              797.4                                                                               25.737  529.8                                                                               579.1                           1850° F./36.0 ksi                                                                  334.4     19.3 30.2                                                                              351.9                                                                               16.000  246.7                                                                               271.4                                      344.5     28.5 31.9                                                                              344.3                                                                               26.174  220.8                                                                               241.9                                      315.4     23.7 30.7                                                                              315.1                                                                               23.5711 183.4                                                                               205.6                           1922° F./20.3 ksi                                                                  753.4     31.7 34.8                                                                              753.2                                                                               27.914  362.3                                                                               462.1                                      728.0     31.5 33.5                                                                              7237.1                                                                              28.362  281.1                                                                               422.2                                      731.6     34.3 38.8                                                                              730.5                                                                               30.770  339.3                                                                               437.3                           1976° F./28.1 ksi                                                                  95.4      29.3 29.4                                                                              94.9 22.842  41.5 50.9                                       95.7      26.7 27.2                                                                              94.7 20.130  45.8 54.7                                       104.6     30.4 33.2                                                                              104.4                                                                               27.517  41.8 54.4                                       100.8     25.6 33.1                                                                              98.9 21.577  40.2 58.1                                       95.8      25.9 28.0                                                                              93.6 19.748  41.1 51.4                                       110.0     29.3 30.3                                                                              108.0                                                                               22.669  48.5 60.1                                       108.2                          43.8                                            104.8                          45.8                                            104.3                          48.6                                 2000° F./18.0 ksi                                                                  464.4     23.1 21.3                                                                              463.6                                                                               18.190  276.7                                                                               293.5                                      411.9     18.3 23.0                                                                              410.4                                                                               15.347  103.5                                                                               227.6                                      370.0     27.0 38.7                                                                              369.8                                                                               25.326  7.6  47.3                            2012° F/14.5 ksi                                                                   790.2     31.2 34.9                                                                              788.7                                                                               24.939  299.9                                                                               406.0                                      671.4     23.6 23.7                                                                              670.3                                                                               13.397  303.3                                                                               396.3                                      512.1     22.6 28.1                                                                              510.4                                                                               21.094  192.5                                                                               277.7                                      651.7     27.4 39.7                                                                              651.3                                                                               16.328  316.7                                                                               434.7                                      754.6     29.7 25.4                                                                              753.1                                                                               24.032  193.8                                                                               388.7                                      008.3     17.7 18.3                                                                              --   --      --   --                                         758.9     30.8 25.4                                                                              758.7                                                                               24.090  388.7                                                                               438.2                                      740.0     19.8 20.5                                                                              739.5                                                                               15.962  316.4                                                                               426.7                                      671.5     26.4 23.8                                                                              669.3                                                                               15.578  359.8                                                                               412.4                           2050° F./14.0 ksi                                                                  410.8     22.9 27.4                                                                              410.0                                                                               18.655  225.4                                                                               272.2                                      283.5     18.0 31.2                                                                              283.5                                                                               15.303  156.4                                                                               191.2                                      320.0     15.8 17.4                                                                              318.3                                                                               12.979  156.4                                                                               191.2                                      389.7     22.0 22.1                                                                              389.7                                                                               18.488  29.9 189.1                                      381.4     27.0 24.1                                                                              381.1                                                                               24.758  69.5 197.9                           2100° F./12.0 ksi                                                                  254.4     12.7 30.4                                                                              252.9                                                                                8.984  108.4                                                                               185.5                                      419.8     20.5 25.0                                                                              419.8                                                                               18.917  201.1                                                                               274.3                           2100° F./12.5 ksi                                                                  331.4     16.9 21.7                                                                              331.1                                                                               15.069  25.2 83.2                                       367.7     19.2 23.2                                                                              366.5                                                                               17.530  75.2 177.4                                      387.3     15.8 17.2                                                                              385.4                                                                               12.742  236.9                                                                               282.0                                      383.1     34.1 32.4                                                                              381.6                                                                               32.135  10.5 164.3                           __________________________________________________________________________

                                      TABLE 13                                     __________________________________________________________________________     CMSX-10M CREEP-RUPTURE                                                                                      FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  563.4     23.2 27.2                                                                              563.2                                                                               22.669  318.5                                                                               366.2                                      553.1     24.5 23.0                                                                              552.7                                                                               21.324  373.1                                                                               402.8                                      526.9     20.7 27.3                                                                              526.4                                                                               19.715  358.2                                                                               390.7                                      594.5     35.1 41.4                                                                              594.4                                                                               32.090  328.8                                                                               372.8                           1850° F./36.0 ksi                                                                  242.9     24.3 20.1                                                                              242.2                                                                               20.686  107.3                                                                               155.6                                      221.9     17.0 21.0                                                                              221.0                                                                               13.888  115.9                                                                               150.4                                      223.4     21.3 21.0                                                                              221.7                                                                               19.196  128.4                                                                               144.7                           1922° F./20.3 ksi                                                                  520.6     26.1 29.3                                                                              520.4                                                                               23.183  234.3                                                                               319.1                                      470.4     26.3 21.2                                                                              469.2                                                                               19.333  176.1                                                                               253.2                                      574.7     16.8 23.0                                                                              573.0                                                                               14.411  282.1                                                                               373.0                           2000° F./18.0 ksi                                                                  434.0     21.5 18.7                                                                              432.1                                                                               20.234  103.5                                                                               233.1                                      437.3     27.1 33.8                                                                              437.3                                                                               25.306  182.6                                                                               240.8                                      430.7     24.6 20.4                                                                              430.7                                                                               23.244   68.8                                                                               192.1                                      430.1     21.1 19.3                                                                              428.9                                                                               19.050   73.7                                                                               213.8                           2050° F./15.0 ksi                                                                  366.1     16.3 12.0                                                                              365.5                                                                               11.326  239.8                                                                               273.3                                      384.0     17.4 16.0                                                                              382.3                                                                               12.055  168.2                                                                               242.9                                      420.2     12.2 13.3                                                                              418.6                                                                               10.017  127.3                                                                               273.2                           __________________________________________________________________________

                                      TABLE 14                                     __________________________________________________________________________     CMSX-10 1 CREEP RUPTURE                                                                                     FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  565.1     35.2 32.0                                                                              564.8                                                                               29.774  297.0                                                                               368.9                                      581.9     32.4 29.3                                                                              580.2                                                                               28.689  371.9                                                                               402.5                                      514.1     24.1 30.2                                                                              514.1                                                                               21.207  318.3                                                                               358.2                           1850/36.0  260.5     25.0 24.8                                                                              259.3                                                                               23.255  156.7                                                                               175.3                                      247.5     22.4 29.1                                                                              245.7                                                                               17.730  131.0                                                                               169.0                                      245.1     23.7 29.0                                                                              246.1                                                                               20.277  137.6                                                                               156.7                           1922/20.3  916.3     24.9 30.3                                                                              914.8                                                                               22.465  472.9                                                                               549.3                                      934.8     32.2 33.0                                                                              934.8                                                                               30.165  353.7                                                                               475.2                                      863.6     27.8 28.5                                                                              862.9                                                                               27.057  295.6                                                                               442.5                           1976/28.1  116.1     19.5 20.1                                                                              116.1                                                                               19.155  57.4 70.1                                       65.6      22.9 20.6                                                                              64.2 21.368  17.8 26.4                                       91.6      23.2 25.3                                                                              90.4 15.544  37.6 49.7                            2000/18.0  430.1     22.7 25.7                                                                              429.2                                                                               18.449  58.9 193.0                                      483.8     19.8 25.1                                                                              483.8                                                                               17.860  102.4                                                                               245.4                           2050/15.0  397.7     17.0 30.0                                                                              397.3                                                                               13.264  239.8                                                                               292.9                                      487.7     21.4 21.9                                                                              487.1                                                                               18.854  248.2                                                                               318.4                                      468.3     18.4 25.5                                                                              467.9                                                                               15.800  194.1                                                                               300.1                           2100/12.0  501.3     10.1 15.9                                                                              498.7                                                                               0.615   --   --                                         401.3     16.8 26.3                                                                              399.7                                                                               15.429  6.6  25.5                                       210.6     11.5 12.7                                                                              210.3                                                                               0.373   --   --                              __________________________________________________________________________

                                      TABLE 15                                     __________________________________________________________________________     CMSX-12A CREEP-RUPTURE                                                                                      FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  491.9     40.2 41.6                                                                              491.8                                                                               38.605  254.0                                                                               293.7                                      420.4     23.5 31.9                                                                              420.3                                                                               19.299  234.9                                                                               277.9                                      383.4     25.3 25.2                                                                              382.9                                                                               22.920  198.1                                                                               244.3                                      456.2     24.1 26.1                                                                              454.5                                                                               22.582  89.9 265.5                                      458.0     30.7 32.7                                                                              457.1                                                                               26.155  253.2                                                                               292.8                                      386.8     30.1 30.4                                                                              386.3                                                                               27.031  172.7                                                                               216.9                                      403.7     34.5 28.8                                                                              402.7                                                                               31.033  140.2                                                                               204.9                                      398.7     21.6 23.5                                                                              398.4                                                                               20.277  181.1                                                                               236.1                           1850/36.0  208.5     32.1 40.5                                                                              208.3                                                                               21.248  100.8                                                                               119.6                                      189.5     21.2 26.2                                                                              189.4                                                                               20.461  99.1 116.3                           1922/20.3  829.6     46.5 45.3                                                                              828.8                                                                               44.488  315.8                                                                               400.7                                      797.0     33.5 32.5                                                                              796.9                                                                               32.856  315.3                                                                               400.5                           2000/18.0  500.3     31.7 29.6                                                                              499.2                                                                               24.922  218.4                                                                               268.5                                      227.6     36.5 41.2                                                                              227.1                                                                               26.825  90.6 113.9                                      430.4     18.5 23.3                                                                              430.4                                                                               18.180  18.180                                                                              234.1                           2050/15.0  424.8     17.0 27.5                                                                              423.3                                                                               15.832  263.5                                                                               301.2                                      366.1     26.2 42.8                                                                              365.5                                                                               20.399  146.6                                                                               197.8                                      400.8     18.2 25.4                                                                              400.7                                                                               16.910  184.6                                                                               251.3                           2100/12.0  255.4     25.8 45.8                                                                              263.6                                                                               22.920  64.1 125.8                                      483.90    10.1 19.3                                                                              482.7                                                                               8.602   378.6                                                                               421.9                                      325.1     7.1  16.6                                                                              325.7                                                                               4.315   268.8                                                                               302.3                           __________________________________________________________________________

Varying the primary gamma prime aging treatment was explored with most of the development activity concentrated on achieving optimized gamma prime size and distribution through longer soak times at 1975° F. (see Table 4) since higher temperature aging treatments accelerated TCP phase formation during the aging cycle.

Ten to twenty-one hour soak times at 1975° F. were successful since they provided average gamma prime particles of about 0.5 um dimension. However, it appeared that shorter primary gamma prime aging time at higher temperature may be more practical, once more stable microstructures were defined.

Microchemical SEM WDX needle particle analyses was performed on a failed CMSX-10G creep-rupture specimen. The specimen, tested at 1976° F./28.1 ksi condition, exhibited needles in its microstructure. The results of the analysis are reported in Table 16 below and indicate, again, that the needles formed in this class of material are particularly rich in Re, but are also enriched with Cr and W.

                  TABLE 16                                                         ______________________________________                                         CMSX-10G                                                                       1976° F./28.1 ksi                                                       104.6 HRS.                                                                     ______________________________________                                         ELEM      K       Z           A    F                                           ______________________________________                                         CRK       0.0426  1.105       0.793                                                                               1.049                                       COK       0.0584  1.094       0.888                                                                               1.086                                       NIK       0.1740  1.140       0.910                                                                               1.116                                       W L       0.2107  0.941       0.972                                                                               1.000                                       REL       0.4767  0.941       0.979                                                                               1.000                                       ______________________________________                                         NEEDLE CHEMISTRY                                                                                       WT %                                                   ELEM           CPS      ELEM                                                   ______________________________________                                         CRK            113.7000 4.63                                                   COK            112.1100 5.54                                                   NIK            305.1425 15.02                                                  W L            134.8988 23.03                                                  REL            276.4000 51.76                                                                          100.00                                                 ______________________________________                                    

A standardized test for resistance to recrystallization was performed on a CMSX-10G test bar. The test method and the results are reported in Table 17 below. The test results indicate that the CMSX-10G specimen exhibited similar resistance to cast process/solution treatment/bonding process recrystallization level in comparison to CMSX-4 alloy.

                  TABLE 17                                                         ______________________________________                                         *Method: A controlled level of compressive stress                              is imparted on the entire surface of an                                        as-cast test bar. The bar is then solution                                     heat treated. Following solution                                               treatment, the bar is sectioned and the                                        transverse section is observed                                                 metallographically. Depth of recrystallization                                 measurements are taken.                                                        *Evaluation Standards:                                                                                Resistance To RX                                                               Anticipated in Blade                                    Alloy       Depth of RX                                                                               Castings                                                ______________________________________                                         CMSX-4      .004"      Very Good                                               SX 792      Entire Bar Very Poor                                               CMSX-10G    .004"      Very Good                                               ______________________________________                                    

The CMSX-10Ga -10Ia, -12B, -12C, -10J, -10Ri and -12Ri compositions were defined and evaluated. No creep-rupture properties were generated for the CMSX-10J specimen, although test bars were produced and a solution heat treatment developed. Again, the inclusion of C and B in the -10J composition appeared to have positive effect to single crystal test specimen yield. Additionally, the lower levels of C and B than evaluated in CMSX-10F specimen, particularly lower B, made the material more amenable to solution heat treatment. Ninety-eight to ninety-nine percent gamma prime solutioning was achieved, as opposed to the approximate 95% level typical of the CMSX-10F composition.

The CMSX-10Ga and -10Ia alloys were designed with N_(v3B) numbers of about 1.70. These alloy specimens contain about 2.5% Cr, 3.3-4.0% Co, 5.6-6.0% Re, greater Ta/W ratio, reduced Cb, and reduced Al+Ti content. Such reduction to Cb+Al+Ti level improved the solutioning characteristics of the materials (see Table 4), plus achievement of increased alloy stability. Both specimens exhibited nearly full gamma prime solutioning.

The lowered N_(v3b) number continued to show effectiveness in providing better creep-rupture capability at temperature greater then 1900° F., while maintaining extremely good creep-strength at lower temperature. CMSX-10Ga test results from specimens produced with improved casting process controls exhibited 700 hours or more life with about 475hours required to creep to 1.0% for 1800° F./36.0 ksi condition. Fur higher temperature exposure, the specimen provided the improved average life of about 500 hours at 2050° F./15.0 ksi condition and average 1.0% creep deformation that occurred at about 250 hours, as indicated by the results reported in Table 18 below.

                                      TABLE 18                                     __________________________________________________________________________     CMSX-10Ga CREEP-RUPTURE                                                                                     FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  500.7     19.9 25.2                                                                              499.7                                                                               19.541  316.5                                                                               360.1                                      584.2     29.1 25.4                                                                              583.9                                                                               26.395  370.0                                                                               401.8                                      505.1     22.6 29.8                                                                              503.7                                                                               18.212  307.4                                                                               347.3                                      730.9     42.0 42.8                                                                              730.7                                                                               40.216  477.6                                                                               516.1                                                                     460.6                                                                          428.5                                1850/36.0  184.5     41.0 33.90                                                                             183.2                                                                               37.154  82.3 94.5                                       291.5     27.3 29.9                                                                              290.2                                                                               19.323  191.6                                                                               207.8                                      279.5     33.9 32.5                                                                              278.1                                                                               29.054  155.3                                                                               180.5                                      323.9     30.9 36.6                                                                              322.9                                                                               29.218  194.1                                                                               217.1                                      326.5+    8.9  12.6                                                                              --   --      --   --                                         295.2+    33.3 33.5                                                                              --   --      --   --                                                                        174.1                                                                          162.3                                           300.1+    22.8 22.4                                                                              --   --      --   --                              1976/28.1  88.6      34.9 33.9                                                                              88.6 25.502  39.7 48.9                                       100.1     28.2 29.2                                                                              96.8 19.706  53.9 61.3                                       107.9     28.8 31.4                                                                              107.0                                                                               23.657  51.1 62.1                                       87.1      27.0 33.8                                                                              87.1 24.177  39.2 48.5                                       82.8      23.3 27.7                                                                              81.0 17.301  20.6 38.0                                       88.2      31.2 35.2                                                                              86.4 24.463  33.6 44.4                                       83.7      34.0 34.3                                                                              83.4 29.718  36.3 45.1                                       114.1     24.3 26.3                                                                              113.0                                                                               20.544  62.1 73.2                                       122.3     18.3 21.3                                                                              120.7                                                                               15.740  76.5 86.0                                       117.7     23.2 25.6                                                                              117.5                                                                               22.284  78.0 85.3                                       (INTERRUPTED TESTS)                                                                              40.2 1.036   39.9 --                                                           43.4 1.187   42.3 --                                         99.3+     60.1 38.8                                                                              --   --      --   --                                         127.9     41.5 34.5                                                                              127.5                                                                               37.493  51.2 62.6                                       96.8      22.9 27.9                                                                              96.5 20.124  45.9 54.4                                       118.9     31.3 27.1                                                                              118.0                                                                               24.603  49.5 61.3                                       111.1     25.0 22.8                                                                              110.2                                                                               21.521  46.4 58.0                                       96.6+     24.1 22.9                                                                              --   --      --   --                                         120.3+    25.8 29.4                                                                              --   --      --   --                                         113.0+    27.6 20.5                                                                              --   --      --   --                              1976/18.85 (INTERRUPTED TESTS)                                                                              261.5                                                                               1.015   260.3                                                                               --                                                           207.2                                                                               1.017   204.6                                                                               --                                         592.1     25.8 22.4                                                                              590.4                                                                               23.596  210.1                                                                               305.9                                      570.7     27.2 26.9                                                                              570.7                                                                               26.289  293.3                                                                               332.6                                      535.5     19.3 23.9                                                                              535.2                                                                               17.513  308.2                                                                               344.2                                                                     240.5                                                                          307.6                                2050/15.0  536.8     28.5 27.5                                                                              535.6                                                                               20.662  232.3                                                                               321.3                                      497.0     23.7 23.9                                                                              496.2                                                                               17.600  260.3                                                                               317.9                                      514.8     23.4 24.4                                                                              513.1                                                                               12.500  230.4                                                                               340.4                                      454.1     16.6 35.2                                                                              453.7                                                                               15.476  263.2                                                                               317.1                                      420.3+    33.7 33.2                                                                              --   --      --   --                                         (INTERRUPTED TESTS)                                                                           -- --   --      239.1                                                                               --                                                        -- --   --      189.6                                                                               --                                                        -- --   --      280.3                                                                               --                                         560.1+    --   22.9                                                                              --   --      --   --                              2012/14.5  536.6+    7.3   8.1                                                                              --   --      --   --                                                                        424.6                                2100/12.0  354.1     14.8 36.5                                                                              353.8                                                                               12.646  91.2 219.1                                      343.4+    --   27.2                                                                              --   --      --   --                                                                        91.4                                                                           147.2                                           491.0+    --   16.7                                                                              --   --      --   --                              1700/50.0  +                                                                   __________________________________________________________________________      + Machined From Blade Specimen                                           

1% creep strength is a significant property. Limiting creep strains to 1.0% and 2.0% is extremely important to gas turbine component design, since a component's usefulness is generally measured by its resistance to creep to an approximate 1-2% level, not its ultimate rupture strength. Many prior art alloys may exhibit attractive rupture strength at the >1900° F. level, however, they lack the level of useful strength, i.e., creep strength to 2.0%, that this invention provides in tandem with its far superior strength in test conditions below 1900° F.

The CMSX-10Ia specimens also provided significantly increased creep strength at the higher temperature extremes, but it did not appear to develop strength as good as the CMSX-10Ga specimens in lower temperature tests, as indicated by the results in Table 19 below.

                                      TABLE 19                                     __________________________________________________________________________     CMSX-10 1a CREEP RUPTURE                                                                                    FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  532.0     34.8 32.7                                                                              530.7                                                                               33.000  259.1                                                                               312.5                                      474.6     23.8 29.2                                                                              473.1                                                                               22.886  201.0                                                                               269.2                                      374.3     20.0 21.0                                                                              372.8                                                                               19.238  171.1                                                                               214.7                           1850/36.0  256.0     28.7 28.5                                                                              256.0                                                                               27.867  135.4                                                                               157.1                                      251.4     34.4 30.3                                                                              250.7                                                                               33.055  121.6                                                                               144.6                                      217.8     30.5 22.4                                                                              217.2                                                                               27.000  94.2 117.9                           1976/28.1  85.7      27.5 28.9                                                                              83.8 21.754  36.9 46.2                                       81.9      33.6 31.8                                                                              81.0 24.384  32.1 42.1                                       68.9      26.1 25.8                                                                              67.6 20.960  23.1 32.4                            2012/14.5  930.2     10.0 14.4                                                                              928.4                                                                               9.649   104.6                                                                               455.7                                      844.4     17.7 23.2                                                                              842.8                                                                               16.132  339.7                                                                               502.3                                      864.2     15.3 11.9                                                                              862.8                                                                               14.558  179.9                                                                               453.4                           2050/15.0  510.2     17.8 19.7                                                                              508.4                                                                               15.703  187.2                                                                               312.7                                      528.6     17.9 24.2                                                                              527.0                                                                               14.873  293.7                                                                               364.3                                      438.8     14.3 11.3                                                                              436.4                                                                               13.556  56.0 136.9                           2100/12.0  616.4     19.0 19.1                                                                              616.3                                                                               14.112  60.0 422.5                                      467.7     19.1 26.1                                                                              466.0                                                                               11.373  273.6                                                                               374.8                           __________________________________________________________________________

Similarly, CMSX-12B, with Nv3B at 1.80 level and additional chemistry balance as presented in Table 1, provided attractive creep strength at test condition greater than 1900° F., but did not perform quite as well as CMSX-10Ga in lower temperature tests, as indicated by the results reported in Table 20 below.

                                      TABLE 20                                     __________________________________________________________________________     CMSX-12B CREEP-RUPTURE                                                                                      FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1076° F./28.1 ksi                                                                  91.7      15.3 17.2                                                                              91.2 14.070  43.9 56.2                                       72.6      19.4 23.2                                                                              72.6 17.396  27.4 36.8                                       14.1      5.0   1.3                                                                              12.7 2.300   8.6  11.9                                       98.1      16.9 17.6                                                                              96.4 13.670  17.8 38.9                                       108.2     25.2 24.1                                                                              108.0                                                                               22.794  43.8 58.7                                       106.9     24.7 24.2                                                                              106.3                                                                               21.024  46.1 60.1                                       104.8     24.0 26.8                                                                              104.3                                                                               20.094  45.8 58.7                                       104.3     26.8 21.4                                                                              103.2                                                                               22.347  48.6 60.8                            1800/36.0  515.0     24.7 24.2                                                                              513.3                                                                               19.468  320.1                                                                               358.0                                      536.4     23.2 21.1                                                                              530.8                                                                               22.184  318.3                                                                               359.5                                      304.7     13.2 19.9                                                                              302.9                                                                               12.582  166.0                                                                               200.8                           1850/36.0  262.6     18.4 23.1                                                                              262.4                                                                               17.660  12.5 142.2                           2012/14.5  1031.3    17.2 18.5                                                                              1029.5                                                                              15.113  428.0                                                                               703.7                                      1078.7    15.6 20.0                                                                              1076.7                                                                              15.217  704.2                                                                               819.2                                      839.4     14.9 22.8                                                                              839.2                                                                               9.282   607.6                                                                               677.7                                      836.9     23.2 21.0                                                                              834.8                                                                               18.024  591.1                                                                               658.5                                      722.0     16.4 21.1                                                                              721.9                                                                               15.913  170.8                                                                               333.6                                      711.3     14.5 18.8                                                                              710.8                                                                               12.490  381.9                                                                               531.5                                      711.9     18.3 20.0                                                                              711.4                                                                               16.201  447.7                                                                               530.7                           2050/15.0  507.5     10.0 10.1                                                                              507.2                                                                               9.394   70.4 360.4                                      434.0     17.5 16.8                                                                              434.0                                                                               13.847  241.7                                                                               309.0                           2100/12.0  487.5     25.3 20.3                                                                              486.6                                                                               20.986  18.2 224.7                                      444.9     7.8  11.0                                                                              442.2                                                                               3.884   347.3                                                                               413.6                           __________________________________________________________________________

Alloy composition has the greatest effect on ultimate creep strength. However, some of the variation experienced between alloy derivatives, and particularly for tests exhibiting inconsistent results for a given alloy, can be caused by variation in casting process condition. Casting process thermal gradient variation affects the cast specimen dendrite arm spacing and ultimately, its response to solution heat treatment and primary gamma prime aging treatment. It must, therefore, be recognized that much of the creep-rupture results reported herein may have been generated under non-optimized conditions and may be capable of improvement. Improved casting process control may provide casting microstructures more amenable to solution treatment and study to determine the appropriate primary gamma prime aging treatment to provide the optimum gamma prime particle size, which may result in further mechanical property enhancement.

The CMSX-12C composition was designed to provide a calculated N_(v3B) number of 1.70. The alloy Cr content was designed at 2.8% and Co set at 3.5% aim for this alloy. An attractive Ta/W ratio was maintained while Re content was moderate at 5.8%. The alloy's Al+Ti content was reduced, in comparison to the CMSX-12A and CMSX-12B specimens, to provide improved alloy response to solution procedure.

Similar to the CMSX-10Ga specimen, the CMSX-12C specimen exhibited an improved balance of creep strength for test condition ranging 1800°-2100° F., as reported in Table 21 below.

                                      TABLE 21                                     __________________________________________________________________________     CMSX-12C CREEP-RUPTURE                                                                                      FINAL CREEP  TIME IN HOURS                                   RUPTURE TIME                                                                             %    %  READING      TO REACH                             TEST CONDITION                                                                            HOURS     ELONG.                                                                              RA t. hours                                                                            % deformation                                                                          1.0% 2.0%                            __________________________________________________________________________     1800° F./36.0 ksi                                                                  465.2     31.8 21.0                                                                              464.5                                                                               30.543  173.0                                                                               262.4                                      918.0     26.1 31.2                                                                              517.9                                                                               24.947  268.1                                                                               334.3                                      480.9     28.3 33.6                                                                              480.0                                                                               27.715  239.7                                                                               297.5                                      713.3     30.0 28.0                                                                              713.2                                                                               28.899  455.0                                                                               503.7                           1830/36.0  237.7     28.2 26.8                                                                              237.7                                                                               27.054  11.4.4                                                                              145.3                                      221.2     22.9 27.3                                                                              220.7                                                                               22.491  111.3                                                                               135.2                                      231.7     23.3 24.7                                                                              231.0                                                                               22.614  121.0                                                                               144.7                                      338.9     26.2 27.0                                                                              337.5                                                                               23.256  216.0                                                                               236.3                                      300.1+            --   --      --   --                                         295.2+    33.3 33.5                                                                              --   --      --   --                              1976/28.1  73.2      20.8 29.1                                                                              72.2 17.768  29.3 38.9                                       79.0      28.1 31.8                                                                              77.4 21.533  31.4 41.4                                       83.8      21.6 26.5                                                                              82.3 17.860  34.2 63.8                                       67.6      31.2 29.8                                                                              67.5 24.177  25.5 34.6                                       113.0+                                                                         79.4                           30.8                                            76.2                           32.8                                            68.8                           29.3                                            118.1     26.0 28.0                                                                              116.2                                                                               23.822  49.3 62.0                                                         --   --      29.0 --                                         (INTERRUPTED TESTS)                                                                              --   --      29.4 --                                                           --   --      32.9 --                              1976/18.85 ksi                                 65.4                                                                           218.0                                                                     271.9                                                                               --                                         (INTERRUPTED TESTS)                                                                              --   --      168.9                                                                               --                                                           --   --      116.4                                                                               --                                                                        240.5                                2012/14.5  1001.8    23.6 20.0                                                                              1000.7                                                                              23.348  349.6                                                                               542.8                                      865.5     20.7 26.1                                                                              864.8                                                                               18.807  418.2                                                                               569.3                                                                     61.9                                                                           267.1                                2050/15.0  509.4     13.7 22.3                                                                              508.0                                                                               12.860  158.1                                                                               315.1                                      546.4     15.6 23.6                                                                              546.4                                                                               14.044  323.0                                                                               404.0                                                                     180.8                                                                          44.2                                                                           240.7                                                                          190.9                                2100° F./12.0                                                                      404.3     11.2 21.6                                                                              404.3                                                                               8.438   290.1                                                                               326.4                                      321.7     9.5  15.0                                                                              320.4                                                                               7.671   156.6                                                                               254.1                                      545.1     8.2  22.1                                                                              542.2                                                                               5.351   236.0                                                                               452.9                                      457.4     8.6  23.4                                                                              455.8                                                                               6.612   309.3                                                                               380.9                           2100° F./12.0                                                                      371.4+    14.2 17.1                                                                              --   --      --   --                              1730° F./30.0                                                                      446.9+    16.8 20.4                                                                              --   --      --   --                              1976° F./18.85                                                                     476.6+    19.2 27.1                                                                              --   --      --   --                                         459.9+    30.6 30.2                                                                              --   --      --   --                              1976° F./28.1 ksi                                                                  120.5+    24.1 22.9                                                                              --   --      --   --                                         99.6+     25.8 29.4                                                                              --   --      --   --                              2050° F./15.0                                                                      469.8     --   30.8                                                                              --   --      --   --                                         485.4     --   22.7                                                                              --   --      --   --                              2012° F./14.5 ksi                  638.1                                                                          521.8                                                                          267.1                                                                          61.9                                                                           395.7                                __________________________________________________________________________

With improved casting process controls, this specimen has shown the following 1.0% longitudinal creep strengths, as reported in Table 22 below.

                  TABLE 22                                                         ______________________________________                                                        Time to 1.0% Strain                                             Test Condition Hrs                                                             ______________________________________                                         1800° F./36.0 ksi                                                                      455                                                             2100° F./12.0 ksi                                                                      309.3                                                           ______________________________________                                    

Both alloys provide similarly greater rupture strength than CMSX-4 alloy at condition to 1976° F. Respective improvements to metal temperature capability are reported below in Table 23.

                  TABLE 23                                                         ______________________________________                                                       Approx. Strength Advantage                                       Temperature   Relative to CMSX-4                                               ______________________________________                                         1800° F.                                                                               40° F.                                                   1850° F.                                                                               45° F.                                                   1976° F.                                                                               43° F.                                                   Based on 1.0% creep strength, the respective approximate                       advantages are:                                                                1800° F.                                                                              +46° F.                                                   1850° F.                                                                              +60° F.                                                   1976° F.                                                                              +55° F.                                                   ______________________________________                                          Note that the comparison in not density corrected.                       

For test temperature above 1976° F., the test results indicate that the CMSX-10Ga and CMSX-12C specimens provided slightly lower strength than CMSX-4 alloy. The reduction in strength advantage for these alloys is believed to be the result of TCP phase formation. To address this issue, the alloys CMSX-10Gb, CMSX-10L, CMSX-12Ca, and CMSX-12E, are designed with N_(v3B) number as low as 1.50 (see Table 1) to provide greater phasial stability, and effect much improved high temperature creep-strength while maintaining most of the creep advantage demonstrated for the 1800°-1976° F. test regime.

The CMSX-10Ri and CMSX-12Ri compositions were designed at the 1.91 and 1.92 N_(v3B) levels, respectively. These specimens were subjected to the most extensive testing of properties. They were designed with 2.65% and 3.4% respective Cr levels, with other features remaining similar to the aforementioned alloy design considerations. The properties generated for these two materials confirm the overall invention design concept with the other material iterations able to provide similar physical properties and relatively better blends of mechanical properties.

The CMSX-10Ri and CMSX-12Ri specimens' respective creep-rupture capabilities are reported below in Tables 24 and 25.

                                      TABLE 24                                     __________________________________________________________________________     CMSX-10(Ri) CREEP-RUPTURE                                                                                               TIME                                             RUPTURE          FINAL        IN HOURS                                         TIME   %      %  CREEP READING                                                                               TO REACH                              TEST CONDITION                                                                            HOURS  ELONG. RA t. hours                                                                            % deformation                                                                          1.0%                                                                               2.0%                              __________________________________________________________________________     1675° F./75.0 ksi                                                                  227.3  21.2   33.8                                                                              225.4                                                                               14.359  52.8                                                                               131.5                                        231.6  19.3   31.0                                                                              231.3                                                                               16.671  51.0                                                                               125.1                                        223.4  17.0   22.3                                                                              223.3                                                                               15.360  68.5                                                                               126.6                             1750/50.0  425.9  18.3   33.7                                                                              425.6                                                                               16.047  303.4                                                                              334.7                                        428.0  18.4   29.7                                                                              427.3                                                                               16.229  309.2                                                                              343.0                                        460.8  17.1   25.7                                                                              459.0                                                                               15.308  314.7                                                                              360.3                             1800/36.0  698.5  39.9   34.3                                                                              696.8                                                                               36.980  492.8                                                                              521.5                                        676.3  28.3   33.3                                                                              674.5                                                                               27.221  479.0                                                                              513.8                                        692.9  38.5   31.3                                                                              692.2                                                                               36.494  469.3                                                                              504.9                             1850/36.0  291.2  34.1   33.1                                                                              291.1                                                                               31.774  194.1                                                                              210.4                                        260.0  29.3   32.1                                                                              258.8                                                                               25.321  170.2                                                                              186.4                                        272.3  34.5   31.8                                                                              271.1                                                                               30.940  169.3                                                                              187.1                             1850/27.56 614.0  52.0   42.0                                                                              613.5                                                                               50.482  365.8                                                                              415.5                                        576.3  49.7   39.0                                                                              575.9                                                                               49.193  345.1                                                                              368.2                                        481.1  40.4   35.4                                                                              480.7                                                                               38.294  309.3                                                                              335.4                             1976/28.1  76.2   23.5   31.7                                                                              75.9 22.130  38.6                                                                               46.7                                         80.5   19.0   26.3                                                                              79.8 14.665  44.3                                                                               51.3                                         99.7   26.2   28.1                                                                              98.9 23.480  40.4                                                                               54.0                                         (INTERRUPTED TESTS)           41.4                                                                               --                                                                         37.0                                                                               --                                                                         40.5                                                                               --                                1976/18.85 265.6  29.5   35.7                                                                              264.7                                                                               29.010  158.7                                                                              184.8                                        278.8  51.4   38.8                                                                              278.1                                                                               46.026  82.0                                                                               155.0                                        (INTERRUPTED TESTS)           139.7                                                                              --                                                                         128.8                                                                              --                                                                         100.1                                                                              --                                2012/14.5  490.8  40.2   33.5                                                                              490.5                                                                               37.678  286.5                                                                              335.3                                        447.0  37.0   41.5                                                                              445.0                                                                               32.814  291.4                                                                              319.9                                        (INTERRUPTED TESTS)                                                                             --   --      113.5                                                                              --                                                            --   --      205.7                                                                              --                                                            --   --      202.2                                                                              --                                2050/15.0  251.9  33.6   35.9                                                                              250.0                                                                               25.559  100.0                                                                              149.5                                        318.9  27.1   30.0                                                                              318.2                                                                               23.149  177.5                                                                              221.2                                        (INTERRUPTED TESTS)                                                                             --   --      181.0                                                                              --                                                            --   --      95.5                                                                               --                                                            --   --      34.5                                                                               --                                2100/12.0  400.3  17.9   27.2                                                                              400.1                                                                               17.877  102.8                                                                              225.0                                        362.1  15.3   22.9                                                                              361.8                                                                               14.986  125.7                                                                              217.2                                        389.5  19.9   24.0                                                                              388.2                                                                               19.510  41.1                                                                               180.7                             __________________________________________________________________________

                                      TABLE 25                                     __________________________________________________________________________     CMSX-12(Ri) CREEP-RUPTURE                                                                                               TIME                                             RUPTURE          FINAL        IN HOURS                                         TIME   %      %  CREEP READING                                                                               TO REACH                              TEST CONDITION                                                                            HOURS  ELONG. RA t. hours                                                                            % deformation                                                                          1.0%                                                                               2.0%                              __________________________________________________________________________     1675° F./75.0 ksi                                                                  209.8  22.3   23.1                                                                              209.3                                                                               19.958  2.6 46.3                                         191.4  14.3   17.4                                                                              189.7                                                                               12.483  1.6 42.5                                         189.6  22.0   22.8                                                                              188.3                                                                               19.080  1.5 22.3                              1750/50.0  448.1  26.7   26.6                                                                              447.9                                                                               26.054  302.3                                                                              335.5                                        403.1  19.0   26.9                                                                              401.9                                                                               18.566  210.0                                                                              290.2                                        435.0  19.4   26.9                                                                              434.4                                                                               18.503  89.1                                                                               284.1                             1800/36.0  604.5  34.7   29.9                                                                              604.3                                                                               34.170  349.4                                                                              407.1                                        583.6  37.0   32.0                                                                              581.3                                                                               30.443  391.3                                                                              420.6                                        627.0  25.3   29.7                                                                              627.0                                                                               24.417  412.4                                                                              455.8                             1850/36.0  302.9  33.1   31.3                                                                              301.7                                                                               29.034  198.9                                                                              215.1                                        314.4  32.0   27.1                                                                              312.7                                                                               27.479  201.4                                                                              220.2                             1976/28.1  90.0   19.7   29.2                                                                              88.5 16.627  33.9                                                                               48.8                                         91.5   30.3   31.9                                                                              90.6 29.001  37.3                                                                               47.9                                         68.6   35.3   32.2                                                                              68.4 28.869  17.3                                                                               27.6                                         (INTERRUPTED TESTS)           43.7                                                                               --                                                                         41.4                                                                               --                                                                         38.7                                                                               --                                2012/14.5  324.1  31.4   30.8                                                                              323.9                                                                               24.403  160.1                                                                              207.7                                        481.4  30.9   31.9                                                                              481.1                                                                               29.581  129.9                                                                              299.6                                        551.7  29.9   31.1                                                                              549.2                                                                               25.622  304.4                                                                              375.5                                        (INTERRUPTED TESTS)           256.1                                                                              --                                                                         182.8                                                                              --                                                                         101.5                                                                              --                                2050/15.0  243.4  36.1   35.0                                                                              243.3                                                                               20.614  143.1                                                                              174.2                             2100/12.0  374.8  12.1   20.3                                                                              374.7                                                                               11.743  166.6                                                                              280.4                                        463.6  15.4   25.9                                                                              463.3                                                                               13.594  245.7                                                                              363.3                                        488.0  20.3   25.9                                                                              487.1                                                                               19.550  25.7                                                                               118.9                             __________________________________________________________________________

The method and results of W and Re microstructural segregation investigation undertaken on fully solutioned and partially solutioned CMSX-12Ri test specimens are reported in Table 26 below. The investigation indicated that it is desirable to minimize the amount of microstructure-contained residual eutectic and that for fully solutioned specimens, the solution treatments developed for the invention are successful in minimizing elemental segregation, which is important in attaining optimized mechanical properties and microstructural stability.

                  TABLE 26                                                         ______________________________________                                         Alloy:       CMSX-12 Ri                                                        Test Specimen:                                                                              3/8" Diameter Solid Bar                                           Specimen Condition:                                                                         Fully Solutioned                                                               Solutioned with 2.0% Residual Eutectic                            Analyses Method:                                                                            Microprobe Analyses                                               +     Random array of 350 points across a section at right                           angles to the growth direction                                           +     Seven line scans, 51° apart, 50 point analyses per line           The standard deviation of the W and Re measurements are                        the measure of homogeneity                                                     ______________________________________                                         Results:                                                                                       Standard Deviations                                            CMSX-12 Ri        W        Re                                                  ______________________________________                                         Fully Solutioned  0.27     0.50                                                2% Residual Eutectic                                                                             0.36     0.90                                                Comparison                                                                     Typical CMSX-4    0.57     0.60                                                ______________________________________                                    

Table 27 below reports results of burner rig hot corrosion test undertaken with the CMSX-12Ri specimen. The measurements were taken at the bar location which experienced the maximum attack, i.e., 1652° F. location, with the results showing the DS MAR M 002 alloy experienced approximately 20× more metal loss than the CMSX-12Ri specimen. Visual observation showed a similar result for the CMSX-10Ri alloy. Both CMSX-10Ri alloy and CMSX-12Ri alloy showed similar resistance to attack as CMSX-4 alloy based on visual specimen review at 60, 90 and 120 hours.

                  TABLE 27                                                         ______________________________________                                         HOT CORROSION                                                                  ______________________________________                                         METHOD                                                                         +     Burner Rig                                                                     1742° F. (950° C.)                                               2 ppm salt, standard fuel                                                +     Measurements taken at point of maximum attack                                  which was at 1652° F. (900° C.)                            +     Measurements reported were taken at the average                                minimum diameter of useful metal                                         ______________________________________                                         RESULTS                                                                        +     90 Hour Test                                                                                  Post Test   Metal Loss                                    Alloy      Initial Dia.                                                                             Useful Dia. Per Side                                      ______________________________________                                         DS Mar M 002                                                                              6.88 mm   5.14 mm     .87 mm (.034")                                CMSX-12 Ri 6.86 mm   6.75 mm     .04 mm (.0016")                               ______________________________________                                    

Table 28 below reports the results of cyclic oxidation tests undertaken at 2012° F. with March 1 gas velocity. The CMSX-12Ri specimen was similarly resistant to oxidation attack at 2012° F., however, it was not as good as CMSX-4 at approximately 1886° F. exposure.

                  TABLE 28                                                         ______________________________________                                         Cyclic Oxidation Test                                                          ______________________________________                                         15 Minute Cycles to 2012° F. (1100° C.),                         Cooled To Ambient Between Cycles                                               Mach 1 Gas Velocity                                                            89 Hours Total With 77 Hours at 2012° F.                                ______________________________________                                         RESULT:                                                                        at 1100° C.                                                                            CMSX-12 Ri                                                                     Approx. 0.1 mm loss per side                                                   for every 300 cycles                                                           CMSX-4                                                                         Approx. 0.1 mm loss per side                                                   for every 380 cycles                                            at 1030° C.                                                                            CMSX-12 Ri                                                                     Approx. .105 mm loss per side                                                  after 355 cycles                                                               CMSX-4                                                                         Approx. .03 mm loss per side                                                   after 355 cycles                                                ______________________________________                                    

CMSX-12Ri elevated temperature tensile data is reported in Table 29 below, while the results of impact tests are reported in Table 30 below. The CMSX-12Ri elevated temperature impact strength minimum is similar to CMSX-4 and its maximum occurring at 1742° F., is better.

                  TABLE 29                                                         ______________________________________                                         TENSILE DATA                                                                   CMSX-12 Ri Alloy                                                               Test           0.1% Yld 0.2% Yld                                                                              UTS   Elong RA                                  Temp °F.                                                                       LAUE    ksi      ksi    ksi   %     %                                   ______________________________________                                         1382   2.3°                                                                            150.0    160.8  188.7 13    14                                  1382   2.3°                                                                            153.6    165.1  190.0 13    15                                  1562   6.2°                                                                            136.5    130.8  152.3 27    24                                  1562   6.2°                                                                            135.0    128.9  160.1 25    23                                  1742   5.6°                                                                            92.7     89.2   125.3 24    30                                  1742   5.6°                                                                            99.9     106.2  129.2 24    32                                  1922   3.8°                                                                            69.5     74.3   104.1 19    36                                  1922   3.8°                                                                            72.4     77.6   106.0 19    36                                  ______________________________________                                    

                  TABLE 30                                                         ______________________________________                                         IMPACT DATA                                                                    CMSX-12 Ri                                                                     0.35 Inch Diameter Plain Cylindrical Specimens                                               Test Temperature, °F.                                                     1382   1562     1742 1922                                      ______________________________________                                         CMSX-12 Ri (1 only)                                                                            26 J   20 J     60 J 32 J                                      CMSX-4 (Ave. of 4)                                                                             26 J   21 J     42 J 45 J                                      ______________________________________                                         Further Impact Property Comparison                                             CMSX-2           Min. Impact Strength                                                           16.5 Joules                                                   SRR 99           Min. Impact Strength                                                           20 Joules                                                     ______________________________________                                    

The results of CMSX-12Ri low cycle fatigue tests undertaken at 1382° F. and 1742° F. test conditions, with R=0, are reported in Table 31 below. The data indicates that CMSX-12Ri performance similar to CMSX-4 at 1382° F. condition, while the alloy exhibits approximately 2.5 times the typical CMSX-4 life at 1742° F. condition.

                  TABLE 31                                                         ______________________________________                                         LOW CYCLE FATIGUE                                                              CMSX-12 Ri Alloy                                                               R = 0 (zero to maximum stressing)                                              1382° F. (750° C.)                                                                     1742° F. (950° F.)                         PEAK STRESS           PEAK STRESS                                              ksi   (MPa)    Cycles     ksi   (MPa)  Cycles                                  ______________________________________                                         142   (980)    8686       110   (760)  4427                                    130   (900)    11950      99    (680)  15510                                   125   (860)    20810      87    (600)  37430                                   119   (820)    >100000    75    (520)  92580                                   ______________________________________                                          Performance is similar to CMSX4 at 1382° F. (750° C.)            Compared to CMSX4, at 1742° F. (950° C.) and in the 20000        cycle region, CMSX12 Ri exhibits 2.5 times life or 15% on strength.      

Notched low cycle fatigue test results show the CMSX-12Ri is 21/2 times better than CMSX-4 out to about 30000 cycles, while at 50000 cycles and above, the alloy performance is similar to CMSX-4. The results of these tests performed at 1382° F., K_(t) =2.0 and R=0 test condition, are reported in Table 32 below.

                  TABLE 32                                                         ______________________________________                                         NOTCHED LOW CYCLE FATIGUE                                                      CMSX-12 Ri Alloy                                                               1382° F. (750° C.), K.sub.t = 2.0, R = 0                         PEAK STRESS                                                                    ksi            (MPa)   CYCLES                                                  ______________________________________                                         113.13         (780)   4879                                                    107.33         (740)   9784                                                    95.72          (660)   28470                                                   84.12          (580)   49810                                                   81.22          (560)                                                           78.32          (540)   >115,000                                                75.42          (520)   >115,000                                                ______________________________________                                          Results are 21/2 times better than CMSX4 out to about 30000 cycles.            Results are similar to CMSX4 at 50000 cycles, and above.                 

High cycle fatigue test results for the CMSX-10Ri alloy are reported in Table 33 below. For 1742° F., 100 Hz, R=0 test condition, the alloy exhibited about 21/2 times the typical CMSX-4 lives.

                  TABLE 33                                                         ______________________________________                                         HIGH CYCLE FATIGUE                                                             CMSX-10 Ri Alloy                                                               1742° F. (950° C.), 100 Hz., R = 0                               PEAK STRESS        CYCLES                                                      ksi            (MPa)   (M.sub.f)                                               ______________________________________                                         81.22          (560)   15.2 × 10.sup.6                                   92.82          (640)   3.59 × 10.sup.6                                   104.43         (720)    0.6 × 10.sup.6                                   ______________________________________                                          *Lives are 21/2 times better than CMSX4                                  

The CMSX-10Ri and CMSX-12Ri test data indicates that adequate hot corrosion and oxidation resistance can be achieved with extremely low alloy chromium content. Additionally, extremely good thermo-mechanical fatigue tensile and impact strengths are apparent with the superalloys of this invention.

The results of alloy specimen density measurements are reported in Table 34 below.

                  TABLE 34                                                         ______________________________________                                         SINGLE CRYSTAL ALLOY DENSITY DATA                                                               DENSITY                                                       ALLOY            Lbs/In3                                                       ______________________________________                                         CMSX-10A         .324                                                          CMSX-10B         .324                                                          CMSX-10C         .325                                                          CMSX-10D         .325                                                          CMSX-10E         .325                                                          CMSX-10F         .323                                                          CMSX-10G         .322                                                          CMSX-10Ga        .322                                                          CMSX-10H         .324                                                          CMSX-10I         .322                                                          CMSX-10Ia        .322                                                          CMSX-10J         .327                                                          CMSX-10Gb (10K)  .329                                                          CMSX-12A         .323                                                          CMSX-12B         .325                                                          CMSX-12C         .326                                                          CMSX-12Ca (12D)  .326                                                          CMSX-10 Ri       .326                                                          CMSX-10 Ri       .323                                                          ______________________________________                                    

The alloys of this invention are amenable to HIP processing. Specimens HIP treated as reported in Table 35 below, showed nearly complete pore closure and absence from incipient melting.

                  TABLE 35                                                         ______________________________________                                         HIP condition                                                                  ______________________________________                                         1.  Heat Specimens in the HIP vessel to 2455° F. at minimum                 Argon pressure (approximately 1500 psi) and hold for 4 hours                   while maintaining 2455° F./1500 psi condition.                      2.  While maintaining the 2455° F. operating temperature,                   increase the Argon pressure over 1 hour to 20 ksi. Soak                        specimens at 2455° F./20 ksi condition for 4                        ______________________________________                                             hours.                                                                

Further evaluation of the CMSX-10Ri and CMSX-12Ri alloys was undertaken. The data reported below further shows the unique capabilities exhibited by the alloys of this invention. More specifically, very attractive hot corrosion and dynamic oxidation resistance are exhibited by these alloys in tandem with exceptionally high creep-rupture, thermo-mechanical fatigue, tensile and impact strengths, despite the extremely low level of chromium content employed, thereby providing a unique blend of desirable properties.

Additional tensile data is reported in Table 36 below for the CMSX-10Ri and CMSX-12Ri alloys. These alloys were evaluated at temperatures ranging from Room Temperature (RT) to about 2100° F. This data complements the data reported in Table 29 above.

                  TABLE 36                                                         ______________________________________                                         Tensile Data                                                                   ______________________________________                                         CMSX-10 Ri Alloy                                                               TEST TEMP                                                                               0.1% PS  0.2% PS  TS     ELONG  RA                                    °F.                                                                              ksi      ksi      ksi    %      %                                     ______________________________________                                         68       123.3    123.9    124.0  13     18                                    1202     146.2    147.2    173.2  7      2                                     1202     145.8    146.5    171.6  9      13                                    1382     144.6    147.8    174.8  6      7                                     1382     141.3    144.2    172.6  6      5                                     1562     134.7    132.3    158.1  27     32                                    1562     135.8    132.0    163.0  27     28                                    1742     95.6     90.5     136.2  23     27                                    1742     93.5     90.1     134.2  23     43                                    1922     71.8     76.0     115.4  22     34                                    1922     72.4     73.2     114.6  20     26                                    ______________________________________                                         CMSX-12 Ri Alloy                                                               TEST TEMP                                                                               0.1% PS  0.2% PS  UTS    ELONG  RA                                    °F.                                                                              ksi      ksi      ksi    %      %                                     ______________________________________                                         1202     132.4    132.4    154.6  12     20                                    1202     133.6    133.7    157.7  13     23                                    1382     150.0    160.8    188.7  13     14                                    1382     153.6    165.1    190.0  13     15                                    1562     136.5    130.8    152.3  27     24                                    1562     135.0    128.9    160.1  25     23                                    1742     93.1     89.3     125.3  24     30                                    1742     99.9     106.2    129.2  24     32                                    1922     73.5     76.6     104.1  19     36                                    1922     72.4     77.6     106.0  19     36                                    2102     37.7     41.5     62.9   31     52                                    2102     36.5     40.6     62.4   28     47                                    ______________________________________                                    

Further results of impact tests, in addition to the results reported in Table 30 above, are reported in Table 37 below. Both the CMSX-10Ri and CMSX-12Ri compositions were evaluated at temperatures ranging from 1382°-1922° F.

                  TABLE 37                                                         ______________________________________                                         Impact Data                                                                                              IMPACT ENERGY,                                       ALLOY      TEST TEMP °F.                                                                          JOULES                                               ______________________________________                                         CMSX-10 Ri 1382           31                                                              1382           23                                                              1562           13                                                              1562           16                                                              1742           12                                                              1742           12                                                              1922           16                                                              1922           10                                                   CMSX-12 Ri 1382           26                                                              1382           28                                                              1562           20                                                              1562           25                                                              1742           62                                                              1742           44                                                              1922           32                                                              1922           54                                                   ______________________________________                                    

Plain low cycle fatigue data for the CMSX-10Ri and CMSX-12Ri specimens is reported in Table 38 below. This data complements the data reported in Table 31 above. The tests were performed at 1382° F. and 1742° F., with R=0 and 0.25 Hz test conditions.

                  TABLE 38                                                         ______________________________________                                         Plain Low Cycle Fatigue Data                                                   PEAK STRESS, ksi                                                                              LIFE, CYCLES BROKEN?                                            ______________________________________                                         CMSX-12 Ri Alloy; 1742° F., R = 0, 0.25 Hz                              98.6           5,403        Y                                                  92.8           21,123       Y                                                  87.0           39,811       Y                                                  81.2           47,942       Y                                                  75.4           63,454       Y                                                  72.5           67,009       Y                                                  69.6           101,019      N                                                  CMSX-12 Ri Alloy; 1382° F., R = 0, 0.25 Hz                              150.8          6,940        Y                                                  147.9          5,284        Y                                                  142.1          8,686        Y                                                  130.5          11,950       Y                                                  124.7          20,810       Y                                                  121.8          62,950       Y                                                  118.9          106,600      N                                                  CMSX-12 Ri Alloy; 1742° F., R = 0, 0.25 Hz                              116.0          1,220        Y                                                  110.2          4,427        Y                                                  98.6           15,510       Y                                                  87.0           37,430       Y                                                  75.4           92,580       Y                                                  72.5           123,100      Y                                                  69.6           130,070      N                                                  ______________________________________                                    

The results of notched low cycle fatigue tests (K_(t) =2.2) undertaken with CMSX-10Ri and CMSX-12Ri specimens is reported in Table 39 below. The tests were performed at 1382° F. and 1742° F., with R=0 and 0.25 Hz test conditions.

                  TABLE 39                                                         ______________________________________                                         K.sub.t = 2.2 NOTCHED LOW CYCLE FATIGUE DATA                                   PEAK NOMINAL STRESS                                                            KSI             LIFE, CYCLES   BROKEN?                                         ______________________________________                                         CMSX-10 Ri Alloy; 1742° F., R = 0, 0.25 Hz                              87.0            5,103          Y                                               75.4            28,342         Y                                               69.6            83,687         Y                                               63.8            66,054         Y                                               60.9            41,720         Y                                               58.0            101,263        N                                               CMSX-12 Ri Alloy; 1382° F., R = 0, 0.25 Hz                              113.1           4,879          Y                                               107.3           9,784          Y                                               95.7            28,470         Y                                               84.1            49,810         Y                                               81.2            125,900        N                                               78.3            115,200        N                                               75.4            118,200        N                                               CMSX-12 Ri Alloy; 1742° F., R = 0, 0.25 Hz                              116.0           1,220          Y                                               110.2           4,427          Y                                               98.6            15,510         Y                                               87.0            37,430         Y                                               75.4            92,580         Y                                               72.5            123,100        Y                                               69.6            130,070        N                                               ______________________________________                                    

High cycle fatigue data, which complements the data reported in Table 33 above, is reported in Table 40 below. The data is reported for tests undertaken with CMSX-10Ri and CMSX-12Ri specimens at the respective test conditions of: a) 1742° F., R=0, 100 Hz; and b) 1022° F., R=-1, 100 Hz.

                  TABLE 40                                                         ______________________________________                                         HIGH CYCLE FATIGUE DATA                                                        PEAK STRESS, ksi                                                                              CYCLES × 10.sup.6                                                                     BROKEN?                                            ______________________________________                                         CMSX-10 Ri Alloy; 1742° F., R = 0, 100 Hz                               121.8          0.063        Y                                                  116.0          0.364        Y                                                  113.1          0.117        Y                                                  104.4          0.600        Y                                                  92.8           3.590        Y                                                  81.2           15.194       Y                                                  72.5           53.485       Y                                                  CMSX-12 Ri Alloy; TESTED AT 1022° F., R = -1, 100 Hz                    ±63.8       0.260        Y                                                  ±58.0       0.216        Y                                                  ±52.2       1.566        Y                                                  ±47.9       0.316        Y                                                  ±42.1       1.185        Y                                                  ±39.2       21.75        N                                                  ±36.2       27.66        N                                                  ______________________________________                                    

Bare alloy oxidation data are presented in FIGS. 3 and 4. Both Figures compare the test results for CMSX-10Ri and CMSX-12Ri alloys to results from identical tests performed on the DSM002, CMSX-4 and CMSX-4+Y (120 ppm) alloys. The data presented in these Figures complements the data reported in Table 28 above. FIG. 3 illustrates the results of tests performed out to about 375 cycles at about 2012° F., while FIG. 4 illustrates the results obtained at about 1886° F.

FIG. 5 illustrates a similar alloy capability comparison, except for bare alloy hot corrosion resistance. The burner-rig tests were performed to about 120 hours duration at about 1742° F. with ingestion of 2 ppm salt.

Additional alloy compositions were defined in accordance with this invention for the purpose of further optimizing alloy solution heat treatment characteristics, alloy stability, and creep-rupture strength, while maintaining the extremely good oxidation, hot corrosion and thermo-mechanical fatigue strengths already achieved with the invention.

Table 41 below reports the aim chemistries for additional materials tested, which provide an even better blend of useful engineering property characteristics than the above-described alloys. These optimized compositions typically contain lower chromium and cobalt contents than the materials described in Table 1 above. Furthermore, these optimized alloys typically contain higher rhenium, lower tungsten and lower phasial stability number N_(v3B).

                                      TABLE 41                                     __________________________________________________________________________     ALLOY  C B Cr                                                                               Co Mo W Cb                                                                               Ti                                                                               Al Ta                                                                               Re                                                                               Hf                                                                               Ni Nv3B*                                                                              1  2  3  4                            __________________________________________________________________________     CMSX-10M                                                                              --                                                                               --                                                                               2.0                                                                              1.75                                                                              .40                                                                               5.4                                                                              .08                                                                              .24                                                                              5.78                                                                              8.2                                                                              6.5                                                                              .03                                                                              BAL                                                                               1.50                                                                               11.9                                                                              6.02                                                                              14.3                                                                              20.5                         10K Mod                                                                               --                                                                               --                                                                               1.9                                                                              2.0                                                                               .35                                                                               5.3                                                                              .05                                                                              .15                                                                              5.83                                                                              8.3                                                                              6.5                                                                              .03                                                                              BAL                                                                               1.49                                                                               11.8                                                                              5.98                                                                              14.33                                                                             20.45                        10M Mod                                                                               --                                                                               --                                                                               1.8                                                                              1.6                                                                               .30                                                                               5.3                                                                              .05                                                                              .12                                                                              5.90                                                                              8.2                                                                              6.6                                                                              .03                                                                              BAL                                                                               1.47                                                                               11.9                                                                              6.02                                                                              14.27                                                                             20.4                         CMSX-12F                                                                              --                                                                               --                                                                               2.0                                                                              1.8                                                                               .40                                                                               4.5                                                                              --                                                                               .35                                                                              5.80                                                                              8.8                                                                              6.5                                                                              .03                                                                              BAL                                                                               1.50                                                                               11.0                                                                              6.15                                                                              14.95                                                                             20.2                         12D Mod                                                                               --                                                                               --                                                                               1.9                                                                              2.0                                                                               .40                                                                               4.8                                                                              --                                                                               .40                                                                              5.75                                                                              8.6                                                                              6.5                                                                              .03                                                                              BAL                                                                               1.49                                                                               11.3                                                                              6.15                                                                              14.75                                                                             20.3                         12F Mod                                                                               --                                                                               --                                                                               1.8                                                                              1.6                                                                               .35                                                                               4.4                                                                              --                                                                               .12                                                                              5.92                                                                              8.7                                                                              6.6                                                                              .03                                                                              BAL                                                                               1.44                                                                               11.0                                                                              6.04                                                                              14.74                                                                             20.05                        __________________________________________________________________________      Key:                                                                           1  W + Re                                                                      2  Al + Ti                                                                     3  Al + Ti + Ta + Cb                                                           4  W + Re + Mo + Ta                                                            *Calculated using PWA N35 Method                                         

Table 42 below reports the chemistries for additional alloy heats (200-320 lb. quantities). As with the alloys reported in Table 1 above, the alloys having optimized compositions were produced using production-type procedures, and were made into test bars and test blades by vacuum investment casting.

                                      TABLE 42                                     __________________________________________________________________________     V-1 VIM FURNACE HEAT CHEMISTRIES                                               ALLOY  HEAT NO.                                                                              C  B   Cr Co                                                                               Mo W Cb Ti                                                                               Al Ta                                                                               Re                                                                               Hf                                                                               Ni                                __________________________________________________________________________     CMSX-12D                                                                              VG 30  .001                                                                              <.001                                                                              2.34                                                                              3.2                                                                              .46                                                                               4.5                                                                              <.05                                                                              .50                                                                              5.60                                                                              8.8                                                                              6.3                                                                              .03                                                                              BASE                              CMSX-10K                                                                              VG 31  .002                                                                              <.001                                                                              2.2                                                                               3.3                                                                              .40                                                                               5.4                                                                              .10                                                                               .31                                                                              5.68                                                                              8.5                                                                              6.3                                                                              .03                                                                              BASE                              CMSX-12D                                                                              VG 35  .001                                                                              <.002                                                                              2.5                                                                               3.2                                                                              .46                                                                               4.7                                                                              <.05                                                                              .49                                                                              5.65                                                                              8.7                                                                              6.2                                                                              .03                                                                              BASE                              CMSX-10K                                                                              VG 36  .001                                                                              <.002                                                                              2.3                                                                               3.2                                                                              .40                                                                               5.5                                                                              .10                                                                               .31                                                                              5.73                                                                              8.3                                                                              6.3                                                                              .03                                                                              BASE                              CMSX-10M                                                                              VG 37  .001                                                                              <.002                                                                              2.0                                                                               1.7                                                                              .41                                                                               5.4                                                                              .09                                                                               .26                                                                              5.80                                                                              8.2                                                                              6.5                                                                              .03                                                                              BASE                              CMSX-12F                                                                              VG 38  .001                                                                              <.002                                                                              2.0                                                                               1.8                                                                              .42                                                                               4.5                                                                              <.05                                                                              .35                                                                              5.81                                                                              8.8                                                                              6.5                                                                              .02                                                                              BASE                              CMSX-12D                                                                              VG 44  .001                                                                              <.003                                                                              2.5                                                                               3.2                                                                              .47                                                                               4.6                                                                              <.05                                                                              .50                                                                              5.62                                                                              8.8                                                                              6.2                                                                              .02                                                                              BASE                              CMSX-12D                                                                              VG 45  .001                                                                              <.003                                                                              2.5                                                                               3.2                                                                              .47                                                                               4.7                                                                              <.05                                                                              .50                                                                              5.62                                                                              8.8                                                                              6.3                                                                              .02                                                                              BASE                              CMSX-10K                                                                              VG 46  .001                                                                              <.002                                                                              2.3                                                                               3.3                                                                              .40                                                                               5.5                                                                              .10                                                                               .31                                                                              5.67                                                                              8.3                                                                              6.3                                                                              .03                                                                              BASE                              CMSX-10K                                                                              VG 47  .001                                                                              <.002                                                                              2.3                                                                               3.3                                                                              .41                                                                               5.5                                                                              .10                                                                               .30                                                                              5.72                                                                              8.3                                                                              6.3                                                                              .03                                                                              BASE                              CMSX-10K                                                                              VG 76  .001                                                                              <.002                                                                              2.0                                                                               3.0                                                                              .36                                                                               5.3                                                                              .08                                                                               .22                                                                              5.75                                                                              8.2                                                                              6.4                                                                              .03                                                                              BASE                              CMSX-10K                                                                              VG 77  .001                                                                              <.002                                                                              1.9                                                                               2.0                                                                              .36                                                                               5.3                                                                              .05                                                                               .17                                                                              5.81                                                                              8.4                                                                              6.5                                                                              .04                                                                              BASE                              MOD                                                                            CMSX-10M                                                                              VG 78  .001                                                                              <.002                                                                              1.8                                                                               1.5                                                                              .33                                                                               5.3                                                                              .06                                                                               .12                                                                              5.92                                                                              8.2                                                                              6.6                                                                              .03                                                                              BASE                              MOD                                                                            CMSX-12D                                                                              VG 79  .001                                                                              <.002                                                                              1.8                                                                               2.0                                                                              .40                                                                               4.9                                                                              <.05                                                                              .21                                                                              5.78                                                                              8.6                                                                              6.5                                                                              .03                                                                              BASE                              MOD                                                                            CMSX-12F                                                                              VG 80  .002                                                                              <.002                                                                              1.8                                                                               1.6                                                                              .38                                                                               4.5                                                                              <.05                                                                              .14                                                                              5.92                                                                              8.8                                                                              6.6                                                                              .02                                                                              BASE                              MOD                                                                            CMSX-10K                                                                              VG 81  .001                                                                              <.002                                                                              2.1                                                                               3.1                                                                              .36                                                                               5.3                                                                              .08                                                                               .22                                                                              5.70                                                                              8.2                                                                              6.4                                                                              .03                                                                              BASE                              CMSX-10K                                                                              VG 91  .001                                                                              <.003                                                                              2.0                                                                               3.1                                                                              .37                                                                               5.4                                                                              .08                                                                               .21                                                                              5.76                                                                              8.2                                                                              6.5                                                                              .03                                                                              BASE                              __________________________________________________________________________

Table 43 below reports heat treatment detail for the optimized alloy compositions. They typically require solution heat treatment to 2490°-2500° F. peak process temperature, which generally results in complete γ' solutioning without the occurrence of incipient melting. A three-step aging treatment was utilized.

                                      TABLE 43                                     __________________________________________________________________________     Heat Treatment Detail                                                                 PEAK SOLUTION                                                                  TEMP.                                                                          °F.                                                                               %γ'                                                                               PRIMARY SECONDARY                                    ALLOY  °C.                                                                               SOLUTIONED*                                                                             γ'AGING+                                                                         γ'AGING+                               __________________________________________________________________________     CMSX-10K                                                                              2490      100      2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1365                                                                    CMSX-12D                                                                              2490      100      2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1365                                                                    CMSX-10M                                                                              2499      100      2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1370                                                                    CMSX-12F                                                                              2499      99.0-99.5                                                                               2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1370                                                                    10K MOD                                                                               2490      100      2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1365                                                                    10M MOD                                                                               2499      100      2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1370                                                                    12D MOD                                                                               2490      100      2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1365                                                                    12F MOD                                                                               2499      99.5-100 2106° F./6 hrs                                                                  1600° F./24 + 1400°                                              F./30                                               1370                                                                    __________________________________________________________________________      *Determined by visual estimation                                               +Specimens air cooled from all aging treatments                          

The optimized alloy compositions were evaluated. However, significant data was generated for the CMSX-10K and CMSX-12D compositions, while some test results were generated for the remaining compositions reported in Table 41 above.

Table 44 below reports the results of stress- and creep-rupture tests undertaken with CMSX-10K specimens. Variously sized test bar and blade specimens, which were cast at industrial sources, were utilized for these tests. The test results show extremely good stress and creep-rupture properties for these alloys.

                                      TABLE 44                                     __________________________________________________________________________     CMSX-10K ALLOY STRESS- AND CREEP-RUPTURE DATA                                             RUPTURE                       TIME IN HRS                                      TIME           FINAL CREEP READING                                                                           TO REACH                              TEST CONDITION                                                                            HRS    % EL                                                                               % RA                                                                               t, HRS                                                                             % DEFORMATION                                                                             1.0%                                                                               2.0%                              __________________________________________________________________________     1675° F./75.0 ksi                                                                  153.1  22.0                                                                               28.2                                                                               148.6                                                                              15.868     2.6 26.9                              (913° C./517 MPa)                                                                  174.2  21.3                                                                               29.9                                                                               173.0                                                                              19.471     4.1 30.1                                         177.1  28.0                                                                               32.1                                                                               176.6                                                                              22.934     3.2 24.9                                         144.6  25.9                                                                               28.7                                                                               144.0                                                                              22.431     4.9 23.5                                         166.7  28.0                                                                               30.0                                                                               166.3                                                                              23.971     7.5 28.6                              1750° F./50.0 ksi                                                                  416.4  26.0                                                                               35.3                                                                               416.4                                                                              24.749     215.1                                                                              259.5                             (954° C./345 MPa)                                                                  378.1  26.0                                                                               34.5                                                                               376.8                                                                              24.783     103.4                                                                              196.9                                        401.4  26.0                                                                               28.1                                                                               400.8                                                                              23.538     193.3                                                                              237.9                                        396.8  36.5                                                                               31.5                                                                               396.6                                                                              32.691     168.9                                                                              219.4                                        379.8  22.5                                                                               25.1                                                                               378.6                                                                              19.364     192.5                                                                              240.6                             1800° F./36.0 ksi                                                                  746.3  30.7                                                                               32.0                                                                               744.7                                                                              28.128     402.0                                                                              466.6                             (982° C./248 MPa)                                                                  781.6  30.0                                                                               34.1                                                                               781.2                                                                              27.314     441.3                                                                              505.2                                        536.1  24.2                                                                               30.0                                                                               534.6                                                                              17.794     237.2                                                                              303.6                                        673.8  18.9                                                                               28.1                                                                               672.6                                                                              15.822     289.1                                                                              450.9                                        699.0  26.8                                                                               30.2                                                                               698.4                                                                              24.839     304.6                                                                              412.6                                        * 775.5                                                                               27.7                                                                               27.0                                                                               774.2                                                                              25.177     436.7                                                                              505.7                                        *  **  --  --  --  --         605.8                                                                              --                                           * 809.6                                                                               29.7                                                                               32.1                                                                               807.7                                                                              27.896     519.8                                                                              568.1                             1850° F./36.0 ksi                                                                  308.5  32.9                                                                               27.1                                                                               308.3                                                                              31.302     75.3                                                                               130.0                             (1010° C./248 MPa)                                                                 311.4  22.4                                                                               26.2                                                                               311.1                                                                              22.214     155.8                                                                              193.1                                        313.4  17.8                                                                               24.8                                                                               313.1                                                                              17.552     186.3                                                                              212.3                                        360.3  24.5                                                                               27.6                                                                               359.8                                                                              22.360     203.4                                                                              233.9                                        326.5  27.4                                                                               28.2                                                                               290.7                                                                              21.828     165.3                                                                              188.8                                        326.5  27.4                                                                               28.2                                                                               325.0                                                                              25.191     144.6                                                                              191.5                                        273.8  25.5                                                                               21.4                                                                               --  --         --  --                                           262.6  22.5                                                                               21.0                                                                               --  --         --  --                                           306.0  23.4                                                                               30.4                                                                               305.6                                                                              21.833     164.8                                                                              192.0                                        286.4  21.9                                                                               29.7                                                                               285.4                                                                              19.817     137.8                                                                              169.5                                        326.0  23.9                                                                               26.3                                                                               325.1                                                                              21.846     159.8                                                                              193.9                                        252.8  19.4                                                                               29.3                                                                               251.8                                                                              16.618     138.2                                                                              163.5                                        329.8  19.5                                                                               25.8                                                                               329.0                                                                              17.332     179.4                                                                              214.3                                        * 363.4                                                                               15.3                                                                               21.0                                                                               361.8                                                                              13.560     227.7                                                                              259.5                                        * 339.9                                                                               21.4                                                                               31.4                                                                               338.3                                                                              21.425     180.2                                                                              211.9                                        *  **  --  --  --  --         224.1                                                                              --                                           * 338.1                                                                               14.0                                                                               26.2                                                                               337.2                                                                              12.981     232.6                                                                              260.2                             1976° F./28.1 ksi                                                                  108.5  22.8                                                                               30.4                                                                               107.8                                                                              19.413     39.4                                                                               56.2                              (1080° C./194 MPa)                                                                 105.7  27.7                                                                               29.2                                                                               105.6                                                                              26.812     44.1                                                                               58.0                                         112.7  27.5                                                                               31.1                                                                               112.5                                                                              24.063     44.5                                                                               59.6                                         101.2  29.0                                                                               37.6                                                                               100.8                                                                              20.434     30.7                                                                               48.3                                         90.8   31.4                                                                               35.2                                                                               90.3                                                                               24.775     10.9                                                                               33.1                                         81.2   35.7                                                                               31.7                                                                               --  --         --  --                                           72.6   --  23.5                                                                               --  --         --  --                                           97.0   25.5                                                                               33.2                                                                               95.0                                                                               20.800     33.1                                                                               47.8                                         100.6  28.0                                                                               35.3                                                                               100.4                                                                              24.890     37.8                                                                               52.2                                         93.4   29.1                                                                               32.1                                                                               93.1                                                                               28.746     30.3                                                                               45.9                                         95.3   27.5                                                                               38.5                                                                               94.1                                                                               21.202     37.5                                                                               50.3                                         94.6   25.5                                                                               40.2                                                                               93.5                                                                               19.415     41.7                                                                               54.1                                         * 109.3                                                                               29.6                                                                               35.1                                                                               109.1                                                                              25.613     39.7                                                                               55.4                                         * 105.8                                                                               30.4                                                                               33.8                                                                               105.5                                                                              26.232     42.2                                                                               55.8                                         *  **  --  --  --  --         54.1                                                                               --                                           * 109.8                                                                               25.9                                                                               33.9                                                                               109.3                                                                              19.947     55.9                                                                               65.7                                         *  83.1                                                                               20.0                                                                               29.3                                                                               82.1                                                                               16.771     25.3                                                                               42.7                                         *  76.1                                                                               15.9                                                                               24.3                                                                               76.0                                                                               14.884     22.7                                                                               38.1                                         *  73.2                                                                               15.9                                                                               29.4                                                                               71.5                                                                               13.536     25.1                                                                               39.1                                         *  97.1                                                                               25.1                                                                               23.5                                                                               96.0                                                                               20.700     27.5                                                                               44.4                              1976° F./18.85 ksi                                                                 751.2  21.7                                                                               28.3                                                                               750.4                                                                              19.963     352.7                                                                              469.5                             (1080° C./130 MPa)                                                                 598.8  28.3                                                                               28.4                                                                               597.4                                                                              26.745     85.6                                                                               267.1                                        573.2  23.2                                                                               24.2                                                                               572.6                                                                              21.393     253.9                                                                              340.2                                        528.8  22.4                                                                               25.6                                                                               526.6                                                                              19.462     57.4                                                                               213.2                                        787.6  22.7                                                                               32.6                                                                               787.3                                                                              20.841     265.8                                                                              498.1                                        702.1  27.0                                                                               33.7                                                                               --  --         --  --                                           391.3  17.9                                                                               26.0                                                                               --  --         --  --                                           764.0  22.6                                                                               27.9                                                                               763.7                                                                              22.044     326.1                                                                              447.3                                        648.0  16.6                                                                               17.4                                                                               647.2                                                                              15.384     258.5                                                                              387.0                                        527.3  26.9                                                                               34.3                                                                               526.4                                                                              18.976     166.8                                                                              294.3                                        488.9  16.1                                                                               28.1                                                                               486.6                                                                              13.975     175.5                                                                              284.7                                        714.3  25.5                                                                               39.4                                                                               713.8                                                                              23.576     309.0                                                                              552.9                                        * 742.8                                                                               27.2                                                                               33.5                                                                               742.6                                                                              25.578     344.7                                                                              450.5                                        * 707.4                                                                               22.5                                                                               30.6                                                                               707.2                                                                              21.315     290.8                                                                              414.7                                        * 618.1                                                                               21.2                                                                               18.8                                                                               --  --         --  --                                           * 562.8                                                                               17.3                                                                               24.4                                                                               --  --         --  --                                           * 436.4                                                                               15.7                                                                               16.9                                                                               433.1                                                                              15.580     --  --                                           * 411.6                                                                               10.7                                                                               17.1                                                                               411.2                                                                              10.648     81.5                                                                               238.5                                        *  **  --  --  --  --         236.5                                                                              --                                           595.8  21.8                                                                               30.7                                                                               595.0                                                                              21.612     63.9                                                                               192.0                                        632.1  18.6                                                                               28.9                                                                               631.3                                                                              17.166     188.8                                                                              362.6                                        646.6  23.9                                                                               27.4                                                                               644.6                                                                              20.277     258.6                                                                              376.5                                        706.9  29.6                                                                               31.4                                                                               704.9                                                                              24.728     211.9                                                                              385.4                                        699.2  21.8                                                                               30.7                                                                               698.8                                                                              19.584     110.5                                                                              356.0                                        * 726.2                                                                               23.9                                                                               27.1                                                                               725.3                                                                              21.555     360.5                                                                              440.4                             1995° F./27.5 ksi                                                                  81.1   30.6                                                                               34.6                                                                               80.8                                                                               26.770     29.1                                                                               40.9                              (1090° C./190 MPa)                                                      2012° F./14.5 ksi                                                                  923.7  26.7                                                                               27.5                                                                               921.7                                                                              20.433     154.3                                                                              530.7                             (1100° C./100 MPa)                                                                 802.2  25.1                                                                               25.9                                                                               800.2                                                                              17.830     92.9                                                                               430.7                                        875.4  18.4                                                                               20.5                                                                               873.7                                                                              17.249     204.2                                                                              440.5                                        1005.4 19.5                                                                               29.2                                                                               --  --         --  --                                           973.3  23.9                                                                               27.2                                                                               971.9                                                                              21.912     85.5                                                                               451.8                                        991.8  22.6                                                                               28.5                                                                               990.2                                                                              18.238     497.0                                                                              646.5                             2030° F./18.85 ksi                                                                 263.9  18.3                                                                               26.7                                                                               262.8                                                                              16.085     115.6                                                                              152.9                             (1110° C./130 MPa)                                                                 348.7  24.8                                                                               30.0                                                                               374.4                                                                              20.774     111.6                                                                              207.8                                        * 281.3                                                                               30.0                                                                               34.3                                                                               280.7                                                                              26.564     116.7                                                                              169.8                                        * 292.1                                                                               17.6                                                                               29.6                                                                               290.5                                                                              15.035     131.1                                                                              189.4                                        * 219.5                                                                               --  8.5 --  --         --  --                                           * 212.5                                                                               14.9                                                                               13.6                                                                               --  --         --  --                                           * 219.5                                                                               --  8.5 --  --         --  --                                           * 197.9                                                                               --  13.8                                                                               196.0                                                                              13.386     3.5 59.3                                         * 179.4                                                                               14.1                                                                               19.5                                                                               178.1                                                                              13.013     5.5 38.1                                         *  **  --  --  --  --         98.9                                                                               --                                           * 311.4                                                                               21.7                                                                               25.7                                                                               311.1                                                                              20.961     144.2                                                                              190.4                             2030° F./23.93 ksi                                                                 87.4   21.9                                                                               27.0                                                                               87.3                                                                               21.802     35.1                                                                               47.5                              (1110° C./165 MPa)                                                                 80.6   18.4                                                                               22.9                                                                               79.3                                                                               15.286     34.3                                                                               44.9                                         96.1   21.5                                                                               31.2                                                                               95.0                                                                               15.687     17.4                                                                               40.8                                         99.6   24.1                                                                               34.7                                                                               99.6                                                                               20.676     34.1                                                                               53.9                                         73.5   22.9                                                                               33.9                                                                               73.0                                                                               19.341     23.2                                                                               37.4                                         86.9   23.2                                                                               31.1                                                                               86.6                                                                               20.502     23.8                                                                               42.2                                         62.1   25.1                                                                               39.7                                                                               --  --         --  --                                           75.6   23.9                                                                               31.7                                                                               --  --         --  --                                           93.6   30.2                                                                               41.0                                                                               92.8                                                                               21.605     29.2                                                                               47.0                                         82.9   22.2                                                                               31.7                                                                               82.1                                                                               18.867     18.4                                                                               29.4                                         84.3   27.0                                                                               41.0                                                                               82.7                                                                               19.003     26.6                                                                               42.7                                         77.1   26.2                                                                               36.0                                                                               76.7                                                                               17.478     36.6                                                                               46.1                                         89.1   25.7                                                                               33.8                                                                               87.7                                                                               17.166     30.8                                                                               46.4                                         82.8   38.3                                                                               39.2                                                                               82.5                                                                               33.075     21.8                                                                               37.3                                         80.6   28.1                                                                               31.5                                                                               79.6                                                                               24.158     8.6 24.1                                         67.1   27.0                                                                               35.5                                                                               66.3                                                                               20.514     17.5                                                                               29.8                                         74.5   23.8                                                                               38.3                                                                               73.3                                                                               17.457     22.1                                                                               37.8                                         66.6   19.2                                                                               34.5                                                                               65.5                                                                               12.587     23.1                                                                               36.8                                         77.9   32.6                                                                               37.2                                                                               77.5                                                                               22.917     19.1                                                                               34.6                                         * 100.2                                                                               27.1                                                                               35.7                                                                               96.3                                                                               16.134     27.8                                                                               51.0                                         * 104.8                                                                               35.5                                                                               37.4                                                                               102.0                                                                              17.886     38.3                                                                               57.1                                         *  74.6                                                                               22.3                                                                               25.1                                                                               --  --         --  --                                           *  56.0                                                                               15.3                                                                               15.7                                                                               --  --         --  --                                           *  74.6                                                                               15.2                                                                               20.4                                                                               --  --         --  --                                           *  **  --  --  --  --         47.3                                                                               --                                           * 104.5                                                                               18.4                                                                               29.7                                                                               101.4                                                                              12.862     44.9                                                                               61.19                             2050° F./15.0 Ksi                                                                  732.8  19.5                                                                               25.7                                                                               731.0                                                                              17.012     330.4                                                                              525.7                             (1121° C./103 MPa)                                                                 551.4  20.3                                                                               27.5                                                                               --  --         --  --                                           524.4  15.8                                                                               10.2                                                                               523.0                                                                              13.524     266.2                                                                              356.5                                        318.3  6.8 16.3                                                                               316.4                                                                              3.986      262.9                                                                              295.5                                        557.4  18.4                                                                               29.0                                                                               557.0                                                                              15.720     250.1                                                                              381.3                                        555.3  16.3                                                                               27.5                                                                               555.0                                                                              14.471     204.3                                                                              372.7                                        511.1  15.6                                                                               23.3                                                                               --  --         --  --                                           378.8  8.4 12.1                                                                               --  --         --  --                                           675.7  19.0                                                                               29.1                                                                               675.3                                                                              18.076     166.6                                                                              424.6                                        600.7  14.6                                                                               25.7                                                                               600.0                                                                              13.074     232.9                                                                              425.7                                        573.6  22.4                                                                               27.9                                                                               573.3                                                                              20.727     109.0                                                                              328.0                                        542.0  21.7                                                                               25.9                                                                               540.5                                                                              16.646     192.4                                                                              344.6                                        521.4  17.5                                                                               27.0                                                                               521.2                                                                              12.517     327.9                                                                              398.2                                        * 619.2                                                                               14.9                                                                               29.1                                                                               619.1                                                                              14.395     180.8                                                                              396.4                                        * 646.3                                                                               17.7                                                                               31.0                                                                               645.5                                                                              15.110     203.8                                                                              419.7                                        * 582.9                                                                               9.5 27.6                                                                               580.8                                                                              7.222      155.7                                                                              406.0                                        * 415.8                                                                               14.2                                                                               23.5                                                                               --  --         --  --                                           * 429.0                                                                               22.3                                                                               25.1                                                                               --  --         --  --                                           *  **  --  --  --  --         320.4                                                                              --                                           --     --  --  --  --         17.7                                                                               183.7                                        666.3  20.8                                                                               28.4                                                                               665.0                                                                              18.694     9.1 82.4                                         597.3  14.6                                                                               27.9                                                                               595.8                                                                              11.641     75.0                                                                               344.6                                        597.3  14.6                                                                               27.9                                                                               595.8                                                                              11.641     75.0                                                                               344.6                                        683.9  26.6                                                                               31.4                                                                               683.0                                                                              25.604     9.5 126.6                                        670.9  17.9                                                                               28.1                                                                               670.5                                                                              16.094     70.5                                                                               289.0                                        * 454.6                                                                               21.5                                                                               30.3                                                                               454.4                                                                              21.210     168.1                                                                              275.7                             2100° F./12.0 ksi                                                                  666.0  11.5                                                                               24.5                                                                               665.6                                                                              10.469     100.7                                                                              448.5                             (1149° C./83 MPa)                                                                  597.9  20.0                                                                               32.0                                                                               597.2                                                                              19.809     14.3                                                                               76.0                                         662.1  24.6                                                                               25.1                                                                               662.1                                                                              18.709     33.3                                                                               188.7                                        575.0  17.1                                                                               25.1                                                                               573.5                                                                              16.194     15.1                                                                               116.1                                        473.2  20.6                                                                               33.7                                                                               472.4                                                                              19.563     0.6 22.5                                         543.4  23.1                                                                               35.3                                                                               542.3                                                                              21.563     24.7                                                                               171.3                                        * 484.0                                                                               14.0                                                                               48.0                                                                               483.1                                                                              2.370      227.7                                                                              452.5                                        *  **  --  --  --  --         104.2                                                                              --                                           590.0                                                                              plus                                                                              --  --  590.8                                                                              8.070      22.5                                                                               104.2                                        791.0  17.4                                                                               31.1                                                                               789.6                                                                              19.722     40.7                                                                               145.2                                        746.9  16.5                                                                               31.2                                                                               745.9                                                                              15.607     61.2                                                                               192.3                                        359.1                                                                              plus                                                                              --  --  359.1                                                                              7.643      26.1                                                                               82.6                                         * 423.2                                                                               25.0                                                                               34.7                                                                               421.6                                                                              23.157     76.8                                                                               209.5                             2100° F./10.0 ksi                                                                  839.6  18.0                                                                               24.0                                                                               --  --         --  --                                (1149° C./69 MPa)                                                                  868.1  12.7                                                                               15.2                                                                               --  --         --  --                                2150° F./10.0 ksi                                                                  566.1  10.6                                                                               18.33                                                                              564.1                                                                              8.579      193.6                                                                              443.1                             (1177° C./69 (MPa)                                                                 400.6  15.6                                                                               25.2                                                                               399.8                                                                              15.545     9.8 88.0                                         399.7  18.8                                                                               27.8                                                                               --  --         --  --                                           263.7  10.7                                                                               22.0                                                                               --  --         --  --                                           493.7  23.5                                                                               31.4                                                                               491.9                                                                              22.850     2.6 25.2                                         441.3  21.6                                                                               31.7                                                                               440.5                                                                              19.291     38.9                                                                               124.6                                        427.6  14.2                                                                               25.1                                                                               426.5                                                                              9.801      258.2                                                                              351.8                                        * 472.3                                                                               19.4                                                                               33.5                                                                               472.0                                                                              17.482     42.6                                                                               271.4                                        *  **  --  --  --  --         135.8                                                                              --                                           * 426.6                                                                               21.2                                                                               39.2                                                                               423.7                                                                              16.940     184.1                                                                              299.2                             2150° F./12.0 ksi                                                                  264.1  8.0 27.3                                                                               264.0                                                                              5.097      185.5                                                                              238.2                             (1177° C./83 MPa)                                                                  236.2  18.5                                                                               29.4                                                                               234.8                                                                              16.343     27.7                                                                               74.3                                         225.8  22.7                                                                               40.7                                                                               223.8                                                                              12.435     14.4                                                                               147.1                                        * 265.2                                                                               11.8                                                                               30.9                                                                               264.0                                                                              8.747      68.0                                                                               193.8                                        *  **  --  --  --  --         74.4                                                                               --                                           * 215.9                                                                               26.8                                                                               28.6                                                                               215.9                                                                              25.00      86.7                                                                               155.4                             2200° F./10.0 ksi                                                                  163.2  14.7                                                                               41.9                                                                               161.8                                                                              7.273      70.7                                                                               139.9                             (1204° C./69 MPa)                                                                  110.6  13.0                                                                               43.1                                                                               109.4                                                                              10.797     16.1                                                                               42.5                                         136.1  9.4 42.1                                                                               135.7                                                                              7.305      22.5                                                                               99.7                                         136.5  15.2                                                                               21.8                                                                               --  --         --  --                                           213.9  18.8                                                                               20.6                                                                               --  --         --  --                                           *)205.1                                                                               17.8                                                                               39.4                                                                               204.6                                                                              14.341     72.0                                                                               164.6                                        *  **  --  --  --  --         4.1 --                                __________________________________________________________________________      * 2106° F./6 Hr/AC Primary Age                                          ** Interrupted Creeprupture Test.                                              All results with 2075° F./6 Hr/AC Primary Age.                    

CMSX-10K alloy tensile data are reported in Table 45 below. The tests were performed at temperatures ranging from RT-2012° F. The test results show improvement relative to earlier alloy test results presented in Table 36 above.

                                      TABLE 45                                     __________________________________________________________________________     Tensile Data                                                                   CMSX-10K Alloy                                                                 TEST TEMP.                                                                             0.1% PS                                                                             0.2% PS                                                                             UTS                                                                               ELONG                                                                               RA STATIC MODULUS                                    °F.                                                                             ksi  ksi  ksi                                                                               %    %  E, psi × 10.sup.6                           __________________________________________________________________________     68      135.0                                                                               134.7                                                                               136.6                                                                             10   9  20.3                                                      135.3                                                                               134.9                                                                               139.8                                                                             11   12 19.0                                              842     136.3                                                                               136.0                                                                               139.7                                                                             17   14 18.8                                                      133.9                                                                               134.4                                                                               136.8                                                                             11   9  18.3                                              1202    137.2                                                                               137.6                                                                               157.4                                                                             13   18 17.1                                                      136.9                                                                               136.9                                                                               157.4                                                                             15   28 17.2                                              1382    143.6                                                                               144.6                                                                               177.7                                                                             15   8  16.4                                                      140.7                                                                               141.4                                                                               173.2                                                                             11   11 15.4                                              1562    143.7                                                                               142.1                                                                               166.6                                                                             24   24 15.5                                                      144.2                                                                               141.7                                                                               168.5                                                                             22   20 14.9                                              1742    96.2 91.4 133.6                                                                             26   31 14.9                                                      94.6 90.4 131.8                                                                             26   29 14.4                                              1922    74.7 78.0 107.6                                                                             28   34 13.0                                                      73.7 77.4 107.0                                                                             30   35 12.8                                              __________________________________________________________________________

Dynamic elastic modulus data are reported in Table 46 below. The CMSX-10K alloy data are reported for test conditions ranging from RT-2012° F.

                                      TABLE 46                                     __________________________________________________________________________     Dynamic Elastic Modulus, E                                                     CMSX-10K Alloy                                                                 __________________________________________________________________________     TEST TEMP                                                                             68 212                                                                               392                                                                               572                                                                               752                                                                               932                                                                               1112                                                                              1292                                                                              1472                                                                              1652                                                                              1832                                                                              2012                                   °F.                                                                     E      19.2                                                                              19.1                                                                              18.9                                                                              18.7                                                                              18.2                                                                              17.3                                                                              16.8                                                                              16.3                                                                              15.3                                                                              14.4                                                                              13.1                                                                              11.6                                   psi × 10.sup.6                                                           __________________________________________________________________________

Elevated temperature (1202°-1922° F.) impact data for CMSX-10K and CMSX-12D specimens are reported in Table 47 below. Comparison to other material capabilities can be made by review of the respective Tables 30 and 37, above.

                  TABLE 47                                                         ______________________________________                                         Impact Data                                                                    TEST     ALLOY          ALLOY                                                  TEMPER-  CMSX-10K       CMSX-12D                                               ATURE    IMPACT ENERGY, IMPACT ENERGY,                                         °F.                                                                              JOULES         JOULES                                                 ______________________________________                                         1202     21, 28, 29     22, 24, 29                                             1382     30, 28, 26     32, 30, 29                                             1562     21, 23, 18     23, 25, 21                                             1742     28, 20, 17     19, 44, 38                                             1922     63, 54, 50     34, 33, 53                                             ______________________________________                                    

Plain low cycle fatigue data for CMSX-10K and CMSX-12D specimens is reported in Table 48. The tests were performed at 1382° F., 1562° F. and 1742° F., respectively, with R=0 and 0.25 Hz test conditions. Comparative results are found above in Tables 31 and 38, respectively.

                  TABLE 48                                                         ______________________________________                                         Plain Low Cycle Fatigue Data                                                   CMSX-10K Alloy; R = 0, 0.25 Hz                                                 TEST TEMP PEAK STRESS,                                                         °F.                                                                               ksi          CYCLES     BROKEN ?                                     ______________________________________                                         1382      150.8        8088       Y                                                      137.8        11,120     Y                                                      137.1        21,490     Y                                                      123.3        45,460     Y                                                      119.0        122,111    N                                            1562      150.8        912        Y                                                      142.3        1688       Y                                                      137.8        5101       Y                                                      123.3        10,640     Y                                                      108.8        54,270     Y                                            1742      101.5        9227       Y                                                      84.1         *22,487    N                                            1382      150.8        18,197     Y                                                      137.8        15,290     Y                                                      127.6        48,450     Y                                                      121.8        35,886     Y                                                      116.0        166,893    N                                                      110.2        101,812    N                                            ______________________________________                                          *Test Stopped: Specimen pulled out of threads                            

CMSX-10K notched low cycle fatigue (K_(t) =2.2) data is reported in Table 49 below. The tests were performed at 1742° F., R=0 and 0.25 Hz test conditions. Comparative results are found above in Tables 32 and 39, respectively.

                  TABLE 49                                                         ______________________________________                                         K.sub.t = 2.2 Notched Low Cycle Fatigue Data                                   CMSX-10K Alloy; 1742° F., R = 0, 0.25 Hz                                PEAK NOMINAL                                                                   STRESS,                                                                        ksi            LIFE, CYCLES BROKEN ?                                           ______________________________________                                         87.0           11,070       Y                                                  75.4           41,660       Y                                                  ______________________________________                                    

Bare alloy oxidation data for CMSX-10K and CMSX-12D specimens are reported in Table 50 below. The tests were performed with test conditions of 2012° F., 0.25 ppm salt and cycled four times per hour. Test duration was 200 hours, or 800 cycles. The test results indicate that both alloys exhibit extremely good resistance to oxidation.

                  TABLE 50                                                         ______________________________________                                         Bare Alloy Oxidation Data                                                      ______________________________________                                         CONDITIONS   2012° F.; 0.25 ppm Salt;                                                Cycled 4 times per hour                                           TEST DURATION                                                                               200 hours (800 cycles)                                            RESULTS      CMSX-10K - 0.2 mm Loss on Diameter                                             CMSX-12D - 0.44 mm Loss on Diameter                               SIGNIFICANCE Both alloys performed as good                                                  or better than CMSX-4;                                                         CMSX-10 Ri and CMSX-12 Ri                                                      results illustrated in FIG. 3                                     ______________________________________                                    

FIG. 6 illustrates the results of initial measurements taken on corrosion pins having CMSX-10K and CMSX-12D compositions, which were run at 1742° F., 2 ppm salt conditions out to about 200 hours.

CMSX-12D stress- and creep-rupture data are reported in Table 51 below, while this alloy's respective tensile properties for tests conducted at RT-2102° F. conditions are reported in Table 52 below.

                                      TABLE 51                                     __________________________________________________________________________     CMSX-12D ALLOY STRESS- AND CREEP-RUPTURE DATA                                             RUPTURE                      TIME IN HRS                                       TIME          FINAL CREEP READING                                                                           TO REACH                               TEST CONDITION                                                                            HRS   % EL                                                                               % RA                                                                               t, HRS                                                                             % DEFORMATION                                                                             1.0%                                                                               2.0%                               __________________________________________________________________________     1675° F./75.0 ksi                                                                  112.2 20.1                                                                               23.8                                                                               111.2                                                                              18.232     1.6 12.0                               (913° C./517 MPa)                                                                  109.6 19.8                                                                               22.8                                                                               108.6                                                                              16.246     2.1 9.9                                1750° F./50.0 ksi                                                                  394.4 28.5                                                                               31.0                                                                               393.1                                                                              24.805     178.2                                                                              231.3                              (954° C./345 MPa)                                                                  374.9 28.1                                                                               30.9                                                                               373.3                                                                              23.876     175.7                                                                              225.1                              1800° F./36.0 ksi                                                                  611.9 26.0                                                                               35.2                                                                               611.8                                                                              25.725     306.9                                                                              369.5                              (982° C./248 MPa)                                                                  592.3 29.7                                                                               31.7                                                                               591.6                                                                              27.977     308.4                                                                              366.5                                         * 693.1                                                                              25.1                                                                               22.8                                                                               692.7                                                                              23.926     378.5                                                                              441.6                                         *  ** --  --  --  --         459.9                                                                              --                                 1850° F./36.0 ksi                                                                  237.5 20.5                                                                               29.9                                                                               236.6                                                                              18.377     135.6                                                                              158.4                              (1010° C./248 MPa)                                                                 264.0 23.9                                                                               26.2                                                                               262.5                                                                              22.362     113.4                                                                              151.8                                         252.2 24.8                                                                               24.6                                                                               251.1                                                                              22.049     125.5                                                                              151.1                                         305.9 28.8                                                                               33.1                                                                               305.0                                                                              26.500     157.3                                                                              185.8                                         255.5 19.6                                                                               29.7                                                                               254.4                                                                              18.328     139.2                                                                              163.1                                         266.7 31.3                                                                               33.6                                                                               264.8                                                                              30.686     146.7                                                                              169.6                                         278.3 25.8                                                                               27.9                                                                               278.0                                                                              24.451     137.7                                                                              164.6                                         245.7 25.1                                                                               33.2                                                                               245.5                                                                              24.532     115.1                                                                              141.7                                         * 285.0                                                                              29.9                                                                               32.4                                                                               284.6                                                                              27.967     149.4                                                                              174.5                                         292.3 24.6                                                                               31.0                                                                               291.9                                                                              24.299     101.9                                                                              149.2                                         266.4 27.1                                                                               31.2                                                                               264.9                                                                              24.323     97.7                                                                               146.5                                         239.1 23.5                                                                               26.4                                                                               238.7                                                                              19.758     122.3                                                                              147.3                                         *  ** --  --  --  --         139.4                                                                              --                                            * 320.5                                                                              22.8                                                                               29.5                                                                               319.4                                                                              20.654     194.6                                                                              216.8                              1922° F./32.63 ksi                                                                 105.0 20.1                                                                               32.0                                                                               103.5                                                                              16.107     39.0                                                                               55.9                               (1050° C./225 MPa)                                                                 105.8 32.5                                                                               37.5                                                                               104.9                                                                              24.887     42.2                                                                               56.9                               1976° F./28.1 ksi                                                                  75.1  14.4                                                                               19.6                                                                               74.8                                                                               11.765     38.1                                                                               46.4                               (1080° C./194 MPa)                                                                 101.2 25.0                                                                               25.5                                                                               98.7                                                                               20.433     40.7                                                                               52.7                                          100.8 27.8                                                                               26.6                                                                               98.9                                                                               21.658     45.0                                                                               54.0                                          95.8  29.9                                                                               36.0                                                                               95.8                                                                               25.347     37.1                                                                               50.4                                          86.8  30.0                                                                               30.8                                                                               83.9                                                                               24.506     3.6 19.7                                          95.7  34.7                                                                               38.6                                                                               93.4                                                                               23.003     41.4                                                                               54.2                                          93.7  25.3                                                                               37.0                                                                               93.6                                                                               24.721     35.2                                                                               48.1                                          97.7  24.0                                                                               37.6                                                                               97.5                                                                               21.918     35.3                                                                               49.5                                          * 100.8                                                                              28.7                                                                               32.4                                                                               100.4                                                                              26.164     41.5                                                                               54.1                                          *  88.9                                                                              30.5                                                                               36.2                                                                               88.8                                                                               28.500     38.3                                                                               49.9                                          86.5  24.6                                                                               35.4                                                                               85.3                                                                               18.215     32.3                                                                               45.2                                          84.6  39.0                                                                               37.5                                                                               83.4                                                                               24.246     27.0                                                                               39.9                                          79.0  26.3                                                                               64.8                                                                               76.6                                                                               17.737     33.1                                                                               43.5                                          *  ** --  --  --  --         41.0                                                                               --                                            * 101.1                                                                              25.4                                                                               28.8                                                                               99.1                                                                               19.064     45.9                                                                               57.8                                          85.4  25.7                                                                               35.3                                                                               84.3                                                                               21.424     27.1                                                                               42.9                               1976° F./18.85 ksi                                                                 576.0 23.9                                                                               28.0                                                                               575.5                                                                              22.40      240.1                                                                              341.8                              (1080° C./130 MPa)                                                                 653.6 27.1                                                                               30.0                                                                               653.5                                                                              24.514     205.0                                                                              356.7                                         618.6 24.4                                                                               28.7                                                                               618.0                                                                              24.047     141.0                                                                              294.3                                         687.2 28.1                                                                               32.5                                                                               685.5                                                                              24.805     353.3                                                                              435.9                                         544.3 14.7                                                                               32.3                                                                               542.7                                                                              12.314     319.1                                                                              385.2                                         594.1 25.0                                                                               34.8                                                                               593.7                                                                              24.809     30.4                                                                               204.6                                         625.7 16.9                                                                               25.6                                                                               627.7                                                                              16.868     258.0                                                                              377.3                                         621.3 20.0                                                                               28.0                                                                               619.7                                                                              18.805     202.2                                                                              359.2                                         * 621.5                                                                              22.2                                                                               29.7                                                                               621.5                                                                              21.492     263.9                                                                              377.8                                         * 591.6                                                                              28.7                                                                               32.8                                                                               591.3                                                                              26.922     276.0                                                                              356.3                                         *             --  --         --  --                                            *  ** --  --  --  --         300.5                                                                              --                                 1995° F./27.5 ksi                                                                  77.0  27.8                                                                               37.0                                                                               75.9                                                                               15.867     25.3                                                                               36.4                               (1090° C./190 MPa)                                                      2012° F./14.5 ksi                                                                  816.1 17.9                                                                               25.5                                                                               836.6                                                                              16.222     115.0                                                                              498.4                              (1100° C./100 MPa)                                                                 644.2 19.3                                                                               25.4                                                                               643.1                                                                              15.538     410.0                                                                              482.5                                         1014.7                                                                               11.4                                                                               12.4                                                                               1012.8                                                                             10.433     90.3                                                                               486.2                              2012° F./25.38 ksi                                                                 66.4  30.4                                                                               36.5                                                                               65.6                                                                               22.457     26.1                                                                               34.9                               (1100° C./175 MPa)                                                                 70.4  33.0                                                                               40.1                                                                               70.2                                                                               25.294     21.6                                                                               33.6                               2030° F./23.93 ksi                                                                 74.6  29.3                                                                               32.5                                                                               72.8                                                                               20.312     26.9                                                                               37.9                                          74.6  25.5                                                                               31.3                                                                               72.9                                                                               17.439     32.9                                                                               42.2                                          82.0  28.0                                                                               29.8                                                                               80.9                                                                               22.297     21.7                                                                               37.2                                          89.0  24.1                                                                               33.1                                                                               86.9                                                                               15.458     28.4                                                                               45.4                                          90.1  26.6                                                                               34.9                                                                               89.1                                                                               17.031     44.1                                                                               55.3                                          89.4  27.3                                                                               34.9                                                                               87.6                                                                               19.087     30.5                                                                               46.3                                          75.7  14.3                                                                               33.2                                                                               74.3                                                                               11.315     33.3                                                                               46.3                                          74.7  22.0                                                                               34.1                                                                               74.6                                                                               15.939     21.7                                                                               36.8                                          39.3  22.9                                                                               28.4                                                                               --  --         --  --                                            65.9  22.5                                                                               24.7                                                                               --  --         --  --                                            18.3  17.2                                                                               16.2                                                                               18.3                                                                               16.215     3.7 7.7                                           86.1  32.8                                                                               38.6                                                                               85.8                                                                               28.107     12.9                                                                               31.1                                          77.7  25.3                                                                               32.9                                                                               76.1                                                                               19.766     11.9                                                                               27.2                                          77.5  31.8                                                                               36.7                                                                               77.5                                                                               21.250     6.2 24.6                                          79.9  35.4                                                                               40.0                                                                               79.3                                                                               27.691     20.9                                                                               34.8                                          71.0  23.0                                                                               40.5                                                                               70.5                                                                               17.631     24.8                                                                               37.0                                          *  81.8                                                                              17.7                                                                               36.6                                                                               81.3                                                                               15.115     32.7                                                                               46.0                                          *  83.9                                                                              34.3                                                                               38.6                                                                               83.3                                                                               26.080     25.9                                                                               42.3                                          75.9  40.0                                                                               38.0                                                                               74.9                                                                               24.783     31.8                                                                               41.9                                          71.5  32.0                                                                               34.9                                                                               68.9                                                                               18.452     21.7                                                                               35.4                                          72.4  22.2                                                                               28.0                                                                               71.2                                                                               21.872     11.0                                                                               22.9                                          *  ** --  --  --  --         19.3                                                                               --                                            *  94.6                                                                              25.5                                                                               29.9                                                                               94.4                                                                               23.742     39.2                                                                               52.0                                          65.7  35.5                                                                               39.0                                                                               65.2                                                                               23.050     24.1                                                                               33.4                                          47.7  27.9                                                                               40.2                                                                               46.9                                                                               13.700     9.6 21.3                                          *  56.0                                                                              14.2                                                                               23.5                                                                               --  --         --  --                                 2030° F./18.85 ksi                                                                 254.5 11.3                                                                               30.6                                                                               254.1                                                                              11.229     94.0                                                                               165.4                              (1110° C./130 MPa)                                                                 292.1 22.7                                                                               30.9                                                                               291.8                                                                              21.808     47.3                                                                               151.7                                         * 348.8                                                                              21.8                                                                               28.2                                                                               346.9                                                                              18.201     159.4                                                                              226.7                                         * 241.8                                                                              26.9                                                                               55.6                                                                               241.8                                                                              6.474      99.1                                                                               167.8                                         * 212.5                                                                              14.9                                                                               13.6                                                                               --  --         --  --                                            *  ** --  --  --  --         130.2                                                                              --                                 2030° F./17.40 ksi                                                                 332.1 22.2                                                                               27.2                                                                               330.4                                                                              20.391     54.2                                                                               144.5                              (1110° C./120 MPa)                                                      2050° F./15.0 ksi                                                                  515.1 18.8                                                                               23.8                                                                               513.1                                                                              15.217     217.5                                                                              355.9                              (1121° C./103 MPa)                                                                 587.2 16.8                                                                               20.7                                                                               585.4                                                                              12.339     375.5                                                                              448.5                                         589.4 12.3                                                                               15.9                                                                               589.0                                                                              11.075     208.5                                                                              403.3                                         615.4 20.8                                                                               20.4                                                                               614.7                                                                              19.363     56.5                                                                               222.6                                         565.1 18.5                                                                               28.5                                                                               564.3                                                                              16.599     353.4                                                                              418.0                                         631.9 17.3                                                                               28.4                                                                               631.9                                                                              15.830     403.4                                                                              477.7                                         462.6 15.9                                                                               20.5                                                                               --  --         --  --                                            497.7 12.7                                                                               18.3                                                                               --  --         --  --                                            561.5 9.2 28.5                                                                               561.1                                                                              9.113      129.3                                                                              391.7                                         463.1 9.6 24.2                                                                               461.4                                                                              7.376      316.6                                                                              388.4                                         * 624.2                                                                              21.8                                                                               26.9                                                                               623.7                                                                              21.386     171.3                                                                              262.8                                         * 587.3                                                                              19.2                                                                               23.5                                                                               586.3                                                                              16.712     236.9                                                                              403.3                                         *                                                                              482.9 23.7                                                                               30.2                                                                               481.2                                                                              20.389     28.4                                                                               169.4                                         336.7 13.3                                                                               37.9                                                                               335.0                                                                              10.433     38.3                                                                               173.6                                         24.3  7.1 14.5                                                                               22.8                                                                               3.021      13.0                                                                               19.4                                          *  ** --  --  --  --         316.9                                                                              --                                 2050° F./19.58 ksi                                                                 145.1 28.0                                                                               31.2                                                                               143.9                                                                              19.913     12.0                                                                               68.2                               (1121° C./135 MPa)                                                      2100° F./ 12.0 ksi                                                                 454.2 12.1                                                                               24.3                                                                               --  --         --  --                                 (1149° C./83 MPa)                                                                  384.3 12.5                                                                               32.6                                                                               382.1                                                                              5.913      95.2                                                                               304.6                                         674.6 16.6                                                                               26.1                                                                               673.3                                                                              14.670     165.2                                                                              469.7                                         302.0 13.3                                                                               32.7                                                                               --  --         --  --                                            453.1 --  23.2                                                                               --  --         --  --                                            * 631.8                                                                              16.0                                                                               25.4                                                                               630.8                                                                              13.560     424.4                                                                              516.4                                         585.5 13.0                                                                               27.1                                                                               584.2                                                                              9.484      233.2                                                                              462.3                                         534.1 22.9                                                                               28.8                                                                               532.2                                                                              17.201     44.2                                                                               102.1                                         667.8 17.9                                                                               33.8                                                                               667.2                                                                              15.477     351.5                                                                              454.4                                         *  ** --  --  --  --         73.7                                                                               --                                 2150° F./10.0 ksi                                                                  169.0 24.6                                                                               59.1                                                                               168.2                                                                              5.338      6.9 35.3                               (1177° C./69 MPa)                                                                  356.5 11.6                                                                               42.1                                                                               356.4                                                                              9.793      132.6                                                                              267.6                                         264.9 16.7                                                                               42.2                                                                               --  --         --  --                                            587.4 --  35.9                                                                               --  --         --  --                                            * 367.7                                                                              10.7                                                                               52.6                                                                               366.9                                                                              4.018      11.9                                                                               171.6                                         382.6 --  --  382.6                                                                              5.588      30.2                                                                               92.2                                          461.9 14.5                                                                               44.1                                                                               461.7                                                                              12.483     63.8                                                                               160.5                                         457.2 25.9                                                                               35.9                                                                               453.6                                                                              13.854     13.3                                                                               110.9                                         *  ** --  --  --  --         177.5                                                                              --                                 2150° F./12.0 ksi                                                                  222.0 14.2                                                                               54.4                                                                               219.5                                                                              2.024      58.6                                                                               218.6                              (1177° C./83 MPa)                                                                  * 301.9                                                                              18.3                                                                               39.2                                                                               300.2                                                                              12.751     102.9                                                                              236.6                                         *  ** --  --  --  --         51.7                                                                               --                                 2200° F./10.0 ksi                                                                  102.3 8.9 22.7                                                                               100.1                                                                              6.302      8.0 43.6                               (1204° C./69 MPa)                                                                  178.7 10.0                                                                               40.1                                                                               178.6                                                                              9.854      20.5                                                                               61.0                                          76.9  8.9 23.1                                                                               --  --         --  --                                            133.7 14.7                                                                               20.4                                                                               --  --         --  --                                            * 196.0                                                                              9.9 31.1                                                                               195.9                                                                              8.651      30.5                                                                               82.3                                          * 199.4                                                                              17.4                                                                               40.2                                                                               199.0                                                                              16.811     16.7                                                                               128.6                                         *  ** --  --  --  --         97.1                                                                               --                                 __________________________________________________________________________      * 2106° F./6 Hr/AC Primary Age                                          ** Interrupted Creeprupture Test.                                              All results with 2075° F./6 Hr/AC Primary Age.                    

                                      TABLE 52                                     __________________________________________________________________________     Tensile Data                                                                   CMSX-12D Alloy                                                                 TEST TEMP                                                                             0.1% PS                                                                             0.2% PS                                                                             UTS                                                                               ELONG                                                                               RA STATIC MODULUS                                     °F.                                                                            ksi  ksi  ksi                                                                               %    %  E, psi × 10.sup.6                            __________________________________________________________________________     68     137.4                                                                               137.2                                                                               148.8                                                                             11   12 19.9                                                      133.6                                                                               132.6                                                                               154.6                                                                             17   18 20.3                                               842    138.7                                                                               138.7                                                                               146.9                                                                             14   15 18.6                                                      139.8                                                                               140.1                                                                               145.3                                                                             13   15 19.4                                               1202   142.6                                                                               142.7                                                                               163.0                                                                             13   13 16.8                                                      139.7                                                                               139.8                                                                               162.4                                                                             13   13 17.0                                               1382   137.5                                                                               137.5                                                                               161.0                                                                             14   19 15.7                                               1562   140.2                                                                               138.5                                                                               168.5                                                                             24   22 15.2                                                      138.4                                                                               140.0                                                                               158.8                                                                             24   27 15.7                                               1742   94.6 90.8 138.1                                                                             28   35 14.5                                                      95.1 90.8 136.0                                                                             27   35 15.2                                               1922   69.8 72.5 100.4                                                                             28   40 13.6                                                      70.6 73.2 101.8                                                                             28   39 13.6                                               2102   41.0 43.5 66.0                                                                              29   52 11.6                                                      41.3 43.5 66.6                                                                              37   54 11.7                                               __________________________________________________________________________

Initial creep-rupture test data for CMSX-10M and CMSX-12F specimens is reported below in Tables 53 and 54, respectively.

                                      TABLE 53                                     __________________________________________________________________________     CMSX-10M ALLOY STRESS- AND CREEP-RUPTURE DATA                                             RUPTURE                        TIME IN HRS                                     TIME          FINAL CREEP READING                                                                             TO REACH                             TEST CONDITION                                                                            HRS   % EL                                                                               % RA                                                                               t, HOURS                                                                             % DEFORMATION                                                                             1.0%                                                                               2.0%                             __________________________________________________________________________     1675° F./75.0 ksi                                                                  * 241.4                                                                              25.2                                                                               32.5                                                                               240.6 21.422     15.5                                                                               56.3                             (913° C./517 MPa)                                                       1750° F./50.0 ksi                                                                  * 433.4                                                                              23.5                                                                               30.6                                                                               433.4 22.209     224.1                                                                              271.1                            (954° C./345 MPa)                                                       1800° F./36.0 ksi                                                                  812.5 22.8                                                                               29.7                                                                               811.5 21.894     526.4                                                                              583.5                            (982° C./248 MPa)                                                                  * 832.5                                                                              36.3                                                                               37.2                                                                               831.4 33.464     513.3                                                                              564.7                                       * 902.3                                                                              25.9                                                                               37.4                                                                               901.6 24.806     585.5                                                                              637.2                            1850° F./36.0 ksi                                                                  * 368.9                                                                              29.1                                                                               36.0                                                                               368.1 28.043     216.4                                                                              241.6                            (1010° C./248 MPa)                                                                 * 338.7                                                                              32.1                                                                               38.8                                                                               337.5 28.224     197.7                                                                              220.8                                       * 306.6                                                                              38.2                                                                               35.1                                                                               305.3 34.139     110.0                                                                              171.9                                       * 279.2                                                                              40.5                                                                               38.5                                                                               277.7 34.006     129.6                                                                              156.3                                       * 300.4                                                                              23.2                                                                               36.3                                                                               299.5 20.613     167.4                                                                              194.9                            1976° F./28.1 ksi                                                                  * 129.8                                                                              23.7                                                                               25.4                                                                               127.3 20.141     63.6                                                                               77.9                             (1080° C./194 MPa)                                                                 * 120.7                                                                              19.8                                                                               29.7                                                                               120.6 17.196     55.8                                                                               70.0                                        * 111.2                                                                              31.1                                                                               33.5                                                                               110.9 29.119     43.0                                                                               57.4                                        *  91.8                                                                              22.6                                                                               33.7                                                                               91.0  19.257     31.4                                                                               47.8                                        * 107.3                                                                              31.4                                                                               32.7                                                                               106.1 23.852     61.7                                                                               68.3                             1976° F./18.85 ksi                                                                 * 628.7                                                                              21.8                                                                               27.3                                                                               627.2 20.507     268.8                                                                              364.2                            (1080° C./130 MPa)                                                                 * 505.1                                                                              28.8                                                                               34.0                                                                               504.2 27.062     23.9                                                                               160.5                                       * 440.9                                                                              36.5                                                                               33.8                                                                               439.2 32.847     114.7                                                                              196.7                                       * 825.7                                                                              25.8                                                                               27.1                                                                               825.7 24.969     350.5                                                                              446.7                            2030° F./18.85 ksi                                                                 * 278.9                                                                              13.9                                                                               30.3                                                                               277.8 12.367     80.6                                                                               160.8                            (1110° C./130 MPa)                                                      2030° F./23.93 ksi                                                                 * 122.1                                                                              25.6                                                                               33.4                                                                               120.9 20.097     45.0                                                                               62.9                             (1110° C./165 MPa)                                                                 * 109.9                                                                              27.3                                                                               29.9                                                                               109.7 24.963     41.6                                                                               57.3                                        *  97.6                                                                              30.8                                                                               33.5                                                                               97.2  33.590     2.9 10.1                                        *  92.9                                                                              28.3                                                                               31.3                                                                               92.5  23.808     33.3                                                                               46.9                                        * 101.8                                                                              29.4                                                                               32.9                                                                               100.8 21.883     21.9                                                                               43.2                             2050° F./15.0 ksi                                                                  * 447.2                                                                              21.8                                                                               30.1                                                                               446.9 19.430     88.4                                                                               252.1                            (1121° C./103 MPa)                                                                 * 426.4                                                                              26.3                                                                               32.6                                                                               425.5 23.532     172.3                                                                              272.4                                       * 401.5                                                                              29.6                                                                               30.2                                                                               400.2 25.848     167.5                                                                              236.6                                       * 389.5                                                                              25.8                                                                               35.3                                                                               388.3 18.538     262.0                                                                              293.3                                       502.7 21.6                                                                               30.9                                                                               503.3 20.013     162.5                                                                              291.2                                       616.7 25.6                                                                               32.8                                                                               616.0 25.199     131.5                                                                              347.3                            2100° F./12.0 ksi                                                                  * 581.5                                                                              11.2                                                                               23.0                                                                               581.5 10.455     297.7                                                                              393.6                            (1149° C./83 MPa)                                                                  * 439.3                                                                              26.3                                                                               24.8                                                                               439.1 25.869     140.3                                                                              251.9                                       * 396.4                                                                              26.1                                                                               34.6                                                                               395.0 21.641     70.1                                                                               203.1                                       * 360.8                                                                              24.2                                                                               24.4                                                                               359.2 21.834     53.0                                                                               152.3                                       * 612.9                                                                              22.7                                                                               34.2                                                                               612.4 21.508     281.2                                                                              395.9                            2150° F./10.0 ksi                                                                  * 343.5                                                                              15.3                                                                               38.5                                                                               342.9 11.968     151.3                                                                              244.8                            (1177° C./69 MPa)                                                                  * 301.3                                                                              25.4                                                                               33.8                                                                               299.4 18.100     56.3                                                                               162.6                                       * 316.7                                                                              27.0                                                                               30.4                                                                               314.2 26.101     39.4                                                                               105.7                                       * 214.1                                                                              18.0                                                                               39.0                                                                               213.3 14.428     47.1                                                                               114.8                                       * 536.8                                                                              17.2                                                                               42.0                                                                               534.8 13.419     221.3                                                                              380.5                            2150° F./12.0 ksi                                                                  * 224.4                                                                              19.9                                                                               37.3                                                                               222.9 18.898     8.7 57.7                             (1177° C./83 MPa)                                                                  * 192.3                                                                              12.3                                                                               28.7                                                                               190.3 10.641     7.1 39.8                                        * 172.6                                                                              19.7                                                                               32.5                                                                               170.3 14.187     7.5 42.8                                        * 168.8                                                                              25.6                                                                               37.8                                                                               166.9 19.507     59.1                                                                               96.2                                        * 369.6                                                                              8.8 28.9                                                                               368.4 8.783      118.1                                                                              267.6                            2200° F./10.0 Ksi                                                                  * 186.1                                                                              18.2                                                                               44.9                                                                               185.3 17.445     15.4                                                                               69.4                             (1204° C./69 MPa)                                                       __________________________________________________________________________      * 2106° F./6 Hr/AC Primary Age.                                         ** Interrupted Creeprupture Test.                                        

                                      TABLE 54                                     __________________________________________________________________________     CMSX-12F ALLOY STRESS- AND CREEP-RUPTURE DATA                                             RUPTURE                        TIME IN HRS                                     TIME          FINAL CREEP READING                                                                             TO REACH                             TEST CONDITION                                                                            HRS   % EL                                                                               % RA                                                                               t, HOURS                                                                             % DEFORMATION                                                                             1.0%                                                                               2.0%                             __________________________________________________________________________     1675° F./75.0 ksi                                                                  * 199.8                                                                              26.6                                                                               34.2                                                                               197.0 21.502     8.1 34.0                             (913° C./517 MPa)                                                       1750° F./50.0 ksi                                                                  * 457.4                                                                              20.3                                                                               37.7                                                                               457.3 18.056     255.1                                                                              306.4                            (954° C./345 MPa)                                                                  * 519.7                                                                              32.4                                                                               34.5                                                                               517.7 28.241     279.2                                                                              331.1                                       * 551.7                                                                              23.1                                                                               32.3                                                                               551.6 21.854     280.4                                                                              347.5                            1800° F./36.0 ksi                                                                  * 837.8                                                                              32.2                                                                               35.1                                                                               837.3 31.208     479.2                                                                              565.3                            (982° C./248 MPa)                                                       1850° F./36.0 ksi                                                                  * 290.3                                                                              28.2                                                                               37.6                                                                               288.6 24.734     151.7                                                                              184.8                            (1010° C./248 MPa)                                                                 * 298.3                                                                              36.2                                                                               42.0                                                                               297.2 32.862     163.9                                                                              187.3                                       * 292.5                                                                              31.5                                                                               39.5                                                                               291.0 29.619     132.2                                                                              167.4                                       * 345.3                                                                              31.3                                                                               33.8                                                                               343.6 27.245     220.9                                                                              236.0                            1976° F./28.1 ksi                                                                  * 128.7                                                                              28.8                                                                               34.8                                                                               128.2 25.763     60.5                                                                               72.9                             1080° C./194 MPa)                                                                  *  81.3                                                                              25.8                                                                               37.8                                                                               80.1  17.825     40.0                                                                               48.6                                        * 109.3                                                                              23.4                                                                               32.5                                                                               108.9 22.496     50.9                                                                               62.4                                        * 109.2                                                                              30.8                                                                               35.5                                                                               107.7 25.243     40.0                                                                               55.8                             1976° F./18.85 ksi                                                                 * 782.5                                                                              25.3                                                                               31.4                                                                               782.4 22.654     373.3                                                                              443.1                            (1080° C./130 MPa)                                                                 * 567.3                                                                              26.2                                                                               37.1                                                                               565.5 20.919     188.5                                                                              280.0                                       * 507.8                                                                              30.3                                                                               39.1                                                                               507.0 27.958     221.0                                                                              276.6                                       * 538.2                                                                              34.8                                                                               38.6                                                                               537.8 31.820     222.1                                                                              291.0                            1995° F./27.5 ksi                                                       (1090° C./190 MPa)                                                      2012° F./14.5 ksi                                                       (1100° C./100 MPa)                                                      2030° F./23.93 ksi                                                                 *  56.3                                                                              30.4                                                                               42.0                                                                               55.7  21.806     16.4                                                                               24.5                             (1110° C./165 MPa)                                                                 *  98.3                                                                              30.8                                                                               37.8                                                                               96.9  23.348     21.4                                                                               40.9                                        *  81.9                                                                              19.8                                                                               40.4                                                                               81.5  18.866     31.8                                                                               43.1                                        *  88.7                                                                              34.9                                                                               36.2                                                                               88.0  25.703     29.3                                                                               41.6                             2030° F./18.85 ksi                                                                 * 355.4                                                                              26.8                                                                               27.1                                                                               355.1 26.607     139.7                                                                              188.1                            (1110° C./130 MPa)                                                      2050° F./15.0 ksi                                                                  * 712.2                                                                              21.1                                                                               27.0                                                                               711.3 20.870     74.3                                                                               325.3                            (1121° C./103 MPa)                                                                 * 432.4                                                                              33.9                                                                               38.9                                                                               430.7 29.991     79.5                                                                               211.2                                       * 442.1                                                                              34.5                                                                               32.4                                                                               440.2 32.314     206.8                                                                              261.9                                       * 463.3                                                                              34.6                                                                               37.7                                                                               462.5 28.676     87.1                                                                               218.7                            2100° F./12.0 ksi                                                                  * 682.0                                                                              13.2                                                                               18.9                                                                               681.9 13.080     367.9                                                                              500.3                            (1149° C./83 MPa)                                                       2150° F./10.0 ksi                                                                  * 573.1                                                                              22.4                                                                               34.9                                                                               571.3 20.297     159.3                                                                              249.3                            (1177° C./69 MPa)                                                       2150° F./12.0 ksi                                                                  * **  --  --  --    --         40.8                                                                               89.7                             (1177° C./83 MPa)                                                       2200° F./10.0 ksi                                                       (1204° C./69 MPa)                                                       __________________________________________________________________________      * 2106° F./6 Hr/AC Primary Age                                          ** Interrupted Creeprupture Test.                                        

While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of this invention will be obvious to those skilled in the art. The appended claims and this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the present information. 

What is claimed is:
 1. A single crystal casting to be used under high stress, high temperature conditions up to about 2030° F. characterized by an increased resistance to creep under such conditions, said casting being made from a nickel-based superalloy consisting essentially of the following elements in percent by weight:

    ______________________________________                                         Rhenium               6.2-6.8                                                  Chromium              1.8-2.5                                                  Cobalt                1.5-2.5                                                  Tantalum              8.0-9.0                                                  Tungsten              3.5-6.0                                                  Aluminum              5.5-6.1                                                  Titanium              0.1-0.5                                                  Columbium             0.01-0.1                                                 Molybdenum            0.25-0.60                                                Hafnium               0-0.05                                                   Carbon                0-0.04                                                   Boron                 0-0.01                                                   Yttrium               0-0.01                                                   Cerium                0-0.01                                                   Lanthanum             0-0.01                                                   Manganese             0-0.04                                                   Silicon               0-0.05                                                   Zirconium             0-0.01                                                   Sulfur                0-0.001                                                  Vanadium              0-0.10                                                   Nickel + Incidental   balance                                                  Impurities                                                                     ______________________________________                                    

said superalloy having a phasial stability number N_(V3B) less than about 1.65.
 2. The single crystal casting of claim 1 wherein said casting has been aged at a temperature of from 2050° F. to 2125° F. for 1 to 20 hours.
 3. The single crystal casting of claim 1 wherein said casting is a component for a turbine engine.
 4. The single crystal casting of claim 1 wherein said casting is a gas turbine blade.
 5. The single crystal casting of claim 1 wherein said casting is a gas turbine vane.
 6. The single crystal casting of claim 1 wherein said casting is further characterized by increased oxidation and hot corrosion resistance under said conditions. 